// CodeMirror version 3.16

//

// CodeMirror is the only global var we claim

window.CodeMirror = (function() {

  "use strict";



  // BROWSER SNIFFING



  // Crude, but necessary to handle a number of hard-to-feature-detect

  // bugs and behavior differences.

  var gecko = /gecko\/\d/i.test(navigator.userAgent);

  var ie = /MSIE \d/.test(navigator.userAgent);

  var ie_lt8 = ie && (document.documentMode == null || document.documentMode < 8);

  var ie_lt9 = ie && (document.documentMode == null || document.documentMode < 9);

  var webkit = /WebKit\//.test(navigator.userAgent);

  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(navigator.userAgent);

  var chrome = /Chrome\//.test(navigator.userAgent);

  var opera = /Opera\//.test(navigator.userAgent);

  var safari = /Apple Computer/.test(navigator.vendor);

  var khtml = /KHTML\//.test(navigator.userAgent);

  var mac_geLion = /Mac OS X 1\d\D([7-9]|\d\d)\D/.test(navigator.userAgent);

  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(navigator.userAgent);

  var phantom = /PhantomJS/.test(navigator.userAgent);



  var ios = /AppleWebKit/.test(navigator.userAgent) && /Mobile\/\w+/.test(navigator.userAgent);

  // This is woefully incomplete. Suggestions for alternative methods welcome.

  var mobile = ios || /Android|webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(navigator.userAgent);

  var mac = ios || /Mac/.test(navigator.platform);

  var windows = /win/i.test(navigator.platform);



  var opera_version = opera && navigator.userAgent.match(/Version\/(\d*\.\d*)/);

  if (opera_version) opera_version = Number(opera_version[1]);

  if (opera_version && opera_version >= 15) { opera = false; webkit = true; }

  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X

  var flipCtrlCmd = mac && (qtwebkit || opera && (opera_version == null || opera_version < 12.11));

  var captureMiddleClick = gecko || (ie && !ie_lt9);



  // Optimize some code when these features are not used

  var sawReadOnlySpans = false, sawCollapsedSpans = false;



  // CONSTRUCTOR



  function CodeMirror(place, options) {

    if (!(this instanceof CodeMirror)) return new CodeMirror(place, options);



    this.options = options = options || {};

    // Determine effective options based on given values and defaults.

    for (var opt in defaults) if (!options.hasOwnProperty(opt) && defaults.hasOwnProperty(opt))

      options[opt] = defaults[opt];

    setGuttersForLineNumbers(options);



    var docStart = typeof options.value == "string" ? 0 : options.value.first;

    var display = this.display = makeDisplay(place, docStart);

    display.wrapper.CodeMirror = this;

    updateGutters(this);

    if (options.autofocus && !mobile) focusInput(this);



    this.state = {keyMaps: [],

                  overlays: [],

                  modeGen: 0,

                  overwrite: false, focused: false,

                  suppressEdits: false, pasteIncoming: false,

                  draggingText: false,

                  highlight: new Delayed()};



    themeChanged(this);

    if (options.lineWrapping)

      this.display.wrapper.className += " CodeMirror-wrap";



    var doc = options.value;

    if (typeof doc == "string") doc = new Doc(options.value, options.mode);

    operation(this, attachDoc)(this, doc);



    // Override magic textarea content restore that IE sometimes does

    // on our hidden textarea on reload

    if (ie) setTimeout(bind(resetInput, this, true), 20);



    registerEventHandlers(this);

    // IE throws unspecified error in certain cases, when

    // trying to access activeElement before onload

    var hasFocus; try { hasFocus = (document.activeElement == display.input); } catch(e) { }

    if (hasFocus || (options.autofocus && !mobile)) setTimeout(bind(onFocus, this), 20);

    else onBlur(this);



    operation(this, function() {

      for (var opt in optionHandlers)

        if (optionHandlers.propertyIsEnumerable(opt))

          optionHandlers[opt](this, options[opt], Init);

      for (var i = 0; i < initHooks.length; ++i) initHooks[i](this);

    })();

  }



  // DISPLAY CONSTRUCTOR



  function makeDisplay(place, docStart) {

    var d = {};



    var input = d.input = elt("textarea", null, null, "position: absolute; padding: 0; width: 1px; height: 1em; outline: none; font-size: 4px;");

    if (webkit) input.style.width = "1000px";

    else input.setAttribute("wrap", "off");

    // if border: 0; -- iOS fails to open keyboard (issue #1287)

    if (ios) input.style.border = "1px solid black";

    input.setAttribute("autocorrect", "off"); input.setAttribute("autocapitalize", "off"); input.setAttribute("spellcheck", "false");



    // Wraps and hides input textarea

    d.inputDiv = elt("div", [input], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");

    // The actual fake scrollbars.

    d.scrollbarH = elt("div", [elt("div", null, null, "height: 1px")], "CodeMirror-hscrollbar");

    d.scrollbarV = elt("div", [elt("div", null, null, "width: 1px")], "CodeMirror-vscrollbar");

    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");

    d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");

    // DIVs containing the selection and the actual code

    d.lineDiv = elt("div", null, "CodeMirror-code");

    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");

    // Blinky cursor, and element used to ensure cursor fits at the end of a line

    d.cursor = elt("div", "\u00a0", "CodeMirror-cursor");

    // Secondary cursor, shown when on a 'jump' in bi-directional text

    d.otherCursor = elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor");

    // Used to measure text size

    d.measure = elt("div", null, "CodeMirror-measure");

    // Wraps everything that needs to exist inside the vertically-padded coordinate system

    d.lineSpace = elt("div", [d.measure, d.selectionDiv, d.lineDiv, d.cursor, d.otherCursor],

                         null, "position: relative; outline: none");

    // Moved around its parent to cover visible view

    d.mover = elt("div", [elt("div", [d.lineSpace], "CodeMirror-lines")], null, "position: relative");

    // Set to the height of the text, causes scrolling

    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");

    // D is needed because behavior of elts with overflow: auto and padding is inconsistent across browsers

    d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerCutOff + "px; width: 1px;");

    // Will contain the gutters, if any

    d.gutters = elt("div", null, "CodeMirror-gutters");

    d.lineGutter = null;

    // Provides scrolling

    d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");

    d.scroller.setAttribute("tabIndex", "-1");

    // The element in which the editor lives.

    d.wrapper = elt("div", [d.inputDiv, d.scrollbarH, d.scrollbarV,

                            d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

    // Work around IE7 z-index bug

    if (ie_lt8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }

    if (place.appendChild) place.appendChild(d.wrapper); else place(d.wrapper);



    // Needed to hide big blue blinking cursor on Mobile Safari

    if (ios) input.style.width = "0px";

    if (!webkit) d.scroller.draggable = true;

    // Needed to handle Tab key in KHTML

    if (khtml) { d.inputDiv.style.height = "1px"; d.inputDiv.style.position = "absolute"; }

    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).

    else if (ie_lt8) d.scrollbarH.style.minWidth = d.scrollbarV.style.minWidth = "18px";



    // Current visible range (may be bigger than the view window).

    d.viewOffset = d.lastSizeC = 0;

    d.showingFrom = d.showingTo = docStart;



    // Used to only resize the line number gutter when necessary (when

    // the amount of lines crosses a boundary that makes its width change)

    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;

    // See readInput and resetInput

    d.prevInput = "";

    // Set to true when a non-horizontal-scrolling widget is added. As

    // an optimization, widget aligning is skipped when d is false.

    d.alignWidgets = false;

    // Flag that indicates whether we currently expect input to appear

    // (after some event like 'keypress' or 'input') and are polling

    // intensively.

    d.pollingFast = false;

    // Self-resetting timeout for the poller

    d.poll = new Delayed();



    d.cachedCharWidth = d.cachedTextHeight = null;

    d.measureLineCache = [];

    d.measureLineCachePos = 0;



    // Tracks when resetInput has punted to just putting a short

    // string instead of the (large) selection.

    d.inaccurateSelection = false;



    // Tracks the maximum line length so that the horizontal scrollbar

    // can be kept static when scrolling.

    d.maxLine = null;

    d.maxLineLength = 0;

    d.maxLineChanged = false;



    // Used for measuring wheel scrolling granularity

    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;



    return d;

  }



  // STATE UPDATES



  // Used to get the editor into a consistent state again when options change.



  function loadMode(cm) {

    cm.doc.mode = CodeMirror.getMode(cm.options, cm.doc.modeOption);

    cm.doc.iter(function(line) {

      if (line.stateAfter) line.stateAfter = null;

      if (line.styles) line.styles = null;

    });

    cm.doc.frontier = cm.doc.first;

    startWorker(cm, 100);

    cm.state.modeGen++;

    if (cm.curOp) regChange(cm);

  }



  function wrappingChanged(cm) {

    if (cm.options.lineWrapping) {

      cm.display.wrapper.className += " CodeMirror-wrap";

      cm.display.sizer.style.minWidth = "";

    } else {

      cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-wrap", "");

      computeMaxLength(cm);

    }

    estimateLineHeights(cm);

    regChange(cm);

    clearCaches(cm);

    setTimeout(function(){updateScrollbars(cm);}, 100);

  }



  function estimateHeight(cm) {

    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;

    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);

    return function(line) {

      if (lineIsHidden(cm.doc, line))

        return 0;

      else if (wrapping)

        return (Math.ceil(line.text.length / perLine) || 1) * th;

      else

        return th;

    };

  }



  function estimateLineHeights(cm) {

    var doc = cm.doc, est = estimateHeight(cm);

    doc.iter(function(line) {

      var estHeight = est(line);

      if (estHeight != line.height) updateLineHeight(line, estHeight);

    });

  }



  function keyMapChanged(cm) {

    var map = keyMap[cm.options.keyMap], style = map.style;

    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-keymap-\S+/g, "") +

      (style ? " cm-keymap-" + style : "");

    cm.state.disableInput = map.disableInput;

  }



  function themeChanged(cm) {

    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +

      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");

    clearCaches(cm);

  }



  function guttersChanged(cm) {

    updateGutters(cm);

    regChange(cm);

    setTimeout(function(){alignHorizontally(cm);}, 20);

  }



  function updateGutters(cm) {

    var gutters = cm.display.gutters, specs = cm.options.gutters;

    removeChildren(gutters);

    for (var i = 0; i < specs.length; ++i) {

      var gutterClass = specs[i];

      var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));

      if (gutterClass == "CodeMirror-linenumbers") {

        cm.display.lineGutter = gElt;

        gElt.style.width = (cm.display.lineNumWidth || 1) + "px";

      }

    }

    gutters.style.display = i ? "" : "none";

  }



  function lineLength(doc, line) {

    if (line.height == 0) return 0;

    var len = line.text.length, merged, cur = line;

    while (merged = collapsedSpanAtStart(cur)) {

      var found = merged.find();

      cur = getLine(doc, found.from.line);

      len += found.from.ch - found.to.ch;

    }

    cur = line;

    while (merged = collapsedSpanAtEnd(cur)) {

      var found = merged.find();

      len -= cur.text.length - found.from.ch;

      cur = getLine(doc, found.to.line);

      len += cur.text.length - found.to.ch;

    }

    return len;

  }



  function computeMaxLength(cm) {

    var d = cm.display, doc = cm.doc;

    d.maxLine = getLine(doc, doc.first);

    d.maxLineLength = lineLength(doc, d.maxLine);

    d.maxLineChanged = true;

    doc.iter(function(line) {

      var len = lineLength(doc, line);

      if (len > d.maxLineLength) {

        d.maxLineLength = len;

        d.maxLine = line;

      }

    });

  }



  // Make sure the gutters options contains the element

  // "CodeMirror-linenumbers" when the lineNumbers option is true.

  function setGuttersForLineNumbers(options) {

    var found = false;

    for (var i = 0; i < options.gutters.length; ++i) {

      if (options.gutters[i] == "CodeMirror-linenumbers") {

        if (options.lineNumbers) found = true;

        else options.gutters.splice(i--, 1);

      }

    }

    if (!found && options.lineNumbers)

      options.gutters.push("CodeMirror-linenumbers");

  }



  // SCROLLBARS



  // Re-synchronize the fake scrollbars with the actual size of the

  // content. Optionally force a scrollTop.

  function updateScrollbars(cm) {

    var d = cm.display, docHeight = cm.doc.height;

    var totalHeight = docHeight + paddingVert(d);

    d.sizer.style.minHeight = d.heightForcer.style.top = totalHeight + "px";

    d.gutters.style.height = Math.max(totalHeight, d.scroller.clientHeight - scrollerCutOff) + "px";

    var scrollHeight = Math.max(totalHeight, d.scroller.scrollHeight);

    var needsH = d.scroller.scrollWidth > (d.scroller.clientWidth + 1);

    var needsV = scrollHeight > (d.scroller.clientHeight + 1);

    if (needsV) {

      d.scrollbarV.style.display = "block";

      d.scrollbarV.style.bottom = needsH ? scrollbarWidth(d.measure) + "px" : "0";

      d.scrollbarV.firstChild.style.height =

        (scrollHeight - d.scroller.clientHeight + d.scrollbarV.clientHeight) + "px";

    } else {

      d.scrollbarV.style.display = "";

      d.scrollbarV.firstChild.style.height = "0";

    }

    if (needsH) {

      d.scrollbarH.style.display = "block";

      d.scrollbarH.style.right = needsV ? scrollbarWidth(d.measure) + "px" : "0";

      d.scrollbarH.firstChild.style.width =

        (d.scroller.scrollWidth - d.scroller.clientWidth + d.scrollbarH.clientWidth) + "px";

    } else {

      d.scrollbarH.style.display = "";

      d.scrollbarH.firstChild.style.width = "0";

    }

    if (needsH && needsV) {

      d.scrollbarFiller.style.display = "block";

      d.scrollbarFiller.style.height = d.scrollbarFiller.style.width = scrollbarWidth(d.measure) + "px";

    } else d.scrollbarFiller.style.display = "";

    if (needsH && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {

      d.gutterFiller.style.display = "block";

      d.gutterFiller.style.height = scrollbarWidth(d.measure) + "px";

      d.gutterFiller.style.width = d.gutters.offsetWidth + "px";

    } else d.gutterFiller.style.display = "";



    if (mac_geLion && scrollbarWidth(d.measure) === 0)

      d.scrollbarV.style.minWidth = d.scrollbarH.style.minHeight = mac_geMountainLion ? "18px" : "12px";

  }



  function visibleLines(display, doc, viewPort) {

    var top = display.scroller.scrollTop, height = display.wrapper.clientHeight;

    if (typeof viewPort == "number") top = viewPort;

    else if (viewPort) {top = viewPort.top; height = viewPort.bottom - viewPort.top;}

    top = Math.floor(top - paddingTop(display));

    var bottom = Math.ceil(top + height);

    return {from: lineAtHeight(doc, top), to: lineAtHeight(doc, bottom)};

  }



  // LINE NUMBERS



  function alignHorizontally(cm) {

    var display = cm.display;

    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) return;

    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;

    var gutterW = display.gutters.offsetWidth, l = comp + "px";

    for (var n = display.lineDiv.firstChild; n; n = n.nextSibling) if (n.alignable) {

      for (var i = 0, a = n.alignable; i < a.length; ++i) a[i].style.left = l;

    }

    if (cm.options.fixedGutter)

      display.gutters.style.left = (comp + gutterW) + "px";

  }



  function maybeUpdateLineNumberWidth(cm) {

    if (!cm.options.lineNumbers) return false;

    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;

    if (last.length != display.lineNumChars) {

      var test = display.measure.appendChild(elt("div", [elt("div", last)],

                                                 "CodeMirror-linenumber CodeMirror-gutter-elt"));

      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;

      display.lineGutter.style.width = "";

      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding);

      display.lineNumWidth = display.lineNumInnerWidth + padding;

      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;

      display.lineGutter.style.width = display.lineNumWidth + "px";

      return true;

    }

    return false;

  }



  function lineNumberFor(options, i) {

    return String(options.lineNumberFormatter(i + options.firstLineNumber));

  }

  function compensateForHScroll(display) {

    return getRect(display.scroller).left - getRect(display.sizer).left;

  }



  // DISPLAY DRAWING



  function updateDisplay(cm, changes, viewPort, forced) {

    var oldFrom = cm.display.showingFrom, oldTo = cm.display.showingTo, updated;

    var visible = visibleLines(cm.display, cm.doc, viewPort);

    for (;;) {

      if (!updateDisplayInner(cm, changes, visible, forced)) break;

      forced = false;

      updated = true;

      updateSelection(cm);

      updateScrollbars(cm);



      // Clip forced viewport to actual scrollable area

      if (viewPort)

        viewPort = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight,

                            typeof viewPort == "number" ? viewPort : viewPort.top);

      visible = visibleLines(cm.display, cm.doc, viewPort);

      if (visible.from >= cm.display.showingFrom && visible.to <= cm.display.showingTo)

        break;

      changes = [];

    }



    if (updated) {

      signalLater(cm, "update", cm);

      if (cm.display.showingFrom != oldFrom || cm.display.showingTo != oldTo)

        signalLater(cm, "viewportChange", cm, cm.display.showingFrom, cm.display.showingTo);

    }

    return updated;

  }



  // Uses a set of changes plus the current scroll position to

  // determine which DOM updates have to be made, and makes the

  // updates.

  function updateDisplayInner(cm, changes, visible, forced) {

    var display = cm.display, doc = cm.doc;

    if (!display.wrapper.clientWidth) {

      display.showingFrom = display.showingTo = doc.first;

      display.viewOffset = 0;

      return;

    }



    // Bail out if the visible area is already rendered and nothing changed.

    if (!forced && changes.length == 0 &&

        visible.from > display.showingFrom && visible.to < display.showingTo)

      return;



    if (maybeUpdateLineNumberWidth(cm))

      changes = [{from: doc.first, to: doc.first + doc.size}];

    var gutterW = display.sizer.style.marginLeft = display.gutters.offsetWidth + "px";

    display.scrollbarH.style.left = cm.options.fixedGutter ? gutterW : "0";



    // Used to determine which lines need their line numbers updated

    var positionsChangedFrom = Infinity;

    if (cm.options.lineNumbers)

      for (var i = 0; i < changes.length; ++i)

        if (changes[i].diff && changes[i].from < positionsChangedFrom) { positionsChangedFrom = changes[i].from; }



    var end = doc.first + doc.size;

    var from = Math.max(visible.from - cm.options.viewportMargin, doc.first);

    var to = Math.min(end, visible.to + cm.options.viewportMargin);

    if (display.showingFrom < from && from - display.showingFrom < 20) from = Math.max(doc.first, display.showingFrom);

    if (display.showingTo > to && display.showingTo - to < 20) to = Math.min(end, display.showingTo);

    if (sawCollapsedSpans) {

      from = lineNo(visualLine(doc, getLine(doc, from)));

      while (to < end && lineIsHidden(doc, getLine(doc, to))) ++to;

    }



    // Create a range of theoretically intact lines, and punch holes

    // in that using the change info.

    var intact = [{from: Math.max(display.showingFrom, doc.first),

                   to: Math.min(display.showingTo, end)}];

    if (intact[0].from >= intact[0].to) intact = [];

    else intact = computeIntact(intact, changes);

    // When merged lines are present, we might have to reduce the

    // intact ranges because changes in continued fragments of the

    // intact lines do require the lines to be redrawn.

    if (sawCollapsedSpans)

      for (var i = 0; i < intact.length; ++i) {

        var range = intact[i], merged;

        while (merged = collapsedSpanAtEnd(getLine(doc, range.to - 1))) {

          var newTo = merged.find().from.line;

          if (newTo > range.from) range.to = newTo;

          else { intact.splice(i--, 1); break; }

        }

      }



    // Clip off the parts that won't be visible

    var intactLines = 0;

    for (var i = 0; i < intact.length; ++i) {

      var range = intact[i];

      if (range.from < from) range.from = from;

      if (range.to > to) range.to = to;

      if (range.from >= range.to) intact.splice(i--, 1);

      else intactLines += range.to - range.from;

    }

    if (!forced && intactLines == to - from && from == display.showingFrom && to == display.showingTo) {

      updateViewOffset(cm);

      return;

    }

    intact.sort(function(a, b) {return a.from - b.from;});



    // Avoid crashing on IE's "unspecified error" when in iframes

    try {

      var focused = document.activeElement;

    } catch(e) {}

    if (intactLines < (to - from) * .7) display.lineDiv.style.display = "none";

    patchDisplay(cm, from, to, intact, positionsChangedFrom);

    display.lineDiv.style.display = "";

    if (focused && document.activeElement != focused && focused.offsetHeight) focused.focus();



    var different = from != display.showingFrom || to != display.showingTo ||

      display.lastSizeC != display.wrapper.clientHeight;

    // This is just a bogus formula that detects when the editor is

    // resized or the font size changes.

    if (different) {

      display.lastSizeC = display.wrapper.clientHeight;

      startWorker(cm, 400);

    }

    display.showingFrom = from; display.showingTo = to;



    updateHeightsInViewport(cm);

    updateViewOffset(cm);



    return true;

  }



  function updateHeightsInViewport(cm) {

    var display = cm.display;

    var prevBottom = display.lineDiv.offsetTop;

    for (var node = display.lineDiv.firstChild, height; node; node = node.nextSibling) if (node.lineObj) {

      if (ie_lt8) {

        var bot = node.offsetTop + node.offsetHeight;

        height = bot - prevBottom;

        prevBottom = bot;

      } else {

        var box = getRect(node);

        height = box.bottom - box.top;

      }

      var diff = node.lineObj.height - height;

      if (height < 2) height = textHeight(display);

      if (diff > .001 || diff < -.001) {

        updateLineHeight(node.lineObj, height);

        var widgets = node.lineObj.widgets;

        if (widgets) for (var i = 0; i < widgets.length; ++i)

          widgets[i].height = widgets[i].node.offsetHeight;

      }

    }

  }



  function updateViewOffset(cm) {

    var off = cm.display.viewOffset = heightAtLine(cm, getLine(cm.doc, cm.display.showingFrom));

    // Position the mover div to align with the current virtual scroll position

    cm.display.mover.style.top = off + "px";

  }



  function computeIntact(intact, changes) {

    for (var i = 0, l = changes.length || 0; i < l; ++i) {

      var change = changes[i], intact2 = [], diff = change.diff || 0;

      for (var j = 0, l2 = intact.length; j < l2; ++j) {

        var range = intact[j];

        if (change.to <= range.from && change.diff) {

          intact2.push({from: range.from + diff, to: range.to + diff});

        } else if (change.to <= range.from || change.from >= range.to) {

          intact2.push(range);

        } else {

          if (change.from > range.from)

            intact2.push({from: range.from, to: change.from});

          if (change.to < range.to)

            intact2.push({from: change.to + diff, to: range.to + diff});

        }

      }

      intact = intact2;

    }

    return intact;

  }



  function getDimensions(cm) {

    var d = cm.display, left = {}, width = {};

    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {

      left[cm.options.gutters[i]] = n.offsetLeft;

      width[cm.options.gutters[i]] = n.offsetWidth;

    }

    return {fixedPos: compensateForHScroll(d),

            gutterTotalWidth: d.gutters.offsetWidth,

            gutterLeft: left,

            gutterWidth: width,

            wrapperWidth: d.wrapper.clientWidth};

  }



  function patchDisplay(cm, from, to, intact, updateNumbersFrom) {

    var dims = getDimensions(cm);

    var display = cm.display, lineNumbers = cm.options.lineNumbers;

    if (!intact.length && (!webkit || !cm.display.currentWheelTarget))

      removeChildren(display.lineDiv);

    var container = display.lineDiv, cur = container.firstChild;



    function rm(node) {

      var next = node.nextSibling;

      if (webkit && mac && cm.display.currentWheelTarget == node) {

        node.style.display = "none";

        node.lineObj = null;

      } else {

        node.parentNode.removeChild(node);

      }

      return next;

    }



    var nextIntact = intact.shift(), lineN = from;

    cm.doc.iter(from, to, function(line) {

      if (nextIntact && nextIntact.to == lineN) nextIntact = intact.shift();

      if (lineIsHidden(cm.doc, line)) {

        if (line.height != 0) updateLineHeight(line, 0);

        if (line.widgets && cur && cur.previousSibling) for (var i = 0; i < line.widgets.length; ++i) {

          var w = line.widgets[i];

          if (w.showIfHidden) {

            var prev = cur.previousSibling;

            if (/pre/i.test(prev.nodeName)) {

              var wrap = elt("div", null, null, "position: relative");

              prev.parentNode.replaceChild(wrap, prev);

              wrap.appendChild(prev);

              prev = wrap;

            }

            var wnode = prev.appendChild(elt("div", [w.node], "CodeMirror-linewidget"));

            if (!w.handleMouseEvents) wnode.ignoreEvents = true;

            positionLineWidget(w, wnode, prev, dims);

          }

        }

      } else if (nextIntact && nextIntact.from <= lineN && nextIntact.to > lineN) {

        // This line is intact. Skip to the actual node. Update its

        // line number if needed.

        while (cur.lineObj != line) cur = rm(cur);

        if (lineNumbers && updateNumbersFrom <= lineN && cur.lineNumber)

          setTextContent(cur.lineNumber, lineNumberFor(cm.options, lineN));

        cur = cur.nextSibling;

      } else {

        // For lines with widgets, make an attempt to find and reuse

        // the existing element, so that widgets aren't needlessly

        // removed and re-inserted into the dom

        if (line.widgets) for (var j = 0, search = cur, reuse; search && j < 20; ++j, search = search.nextSibling)

          if (search.lineObj == line && /div/i.test(search.nodeName)) { reuse = search; break; }

        // This line needs to be generated.

        var lineNode = buildLineElement(cm, line, lineN, dims, reuse);

        if (lineNode != reuse) {

          container.insertBefore(lineNode, cur);

        } else {

          while (cur != reuse) cur = rm(cur);

          cur = cur.nextSibling;

        }



        lineNode.lineObj = line;

      }

      ++lineN;

    });

    while (cur) cur = rm(cur);

  }



  function buildLineElement(cm, line, lineNo, dims, reuse) {

    var lineElement = lineContent(cm, line);

    var markers = line.gutterMarkers, display = cm.display, wrap;



    if (!cm.options.lineNumbers && !markers && !line.bgClass && !line.wrapClass && !line.widgets)

      return lineElement;



    // Lines with gutter elements, widgets or a background class need

    // to be wrapped again, and have the extra elements added to the

    // wrapper div



    if (reuse) {

      reuse.alignable = null;

      var isOk = true, widgetsSeen = 0, insertBefore = null;

      for (var n = reuse.firstChild, next; n; n = next) {

        next = n.nextSibling;

        if (!/\bCodeMirror-linewidget\b/.test(n.className)) {

          reuse.removeChild(n);

        } else {

          for (var i = 0; i < line.widgets.length; ++i) {

            var widget = line.widgets[i];

            if (widget.node == n.firstChild) {

              if (!widget.above && !insertBefore) insertBefore = n;

              positionLineWidget(widget, n, reuse, dims);

              ++widgetsSeen;

              break;

            }

          }

          if (i == line.widgets.length) { isOk = false; break; }

        }

      }

      reuse.insertBefore(lineElement, insertBefore);

      if (isOk && widgetsSeen == line.widgets.length) {

        wrap = reuse;

        reuse.className = line.wrapClass || "";

      }

    }

    if (!wrap) {

      wrap = elt("div", null, line.wrapClass, "position: relative");

      wrap.appendChild(lineElement);

    }

    // Kludge to make sure the styled element lies behind the selection (by z-index)

    if (line.bgClass)

      wrap.insertBefore(elt("div", null, line.bgClass + " CodeMirror-linebackground"), wrap.firstChild);

    if (cm.options.lineNumbers || markers) {

      var gutterWrap = wrap.insertBefore(elt("div", null, null, "position: absolute; left: " +

                                             (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"),

                                         wrap.firstChild);

      if (cm.options.fixedGutter) (wrap.alignable || (wrap.alignable = [])).push(gutterWrap);

      if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))

        wrap.lineNumber = gutterWrap.appendChild(

          elt("div", lineNumberFor(cm.options, lineNo),

              "CodeMirror-linenumber CodeMirror-gutter-elt",

              "left: " + dims.gutterLeft["CodeMirror-linenumbers"] + "px; width: "

              + display.lineNumInnerWidth + "px"));

      if (markers)

        for (var k = 0; k < cm.options.gutters.length; ++k) {

          var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];

          if (found)

            gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt", "left: " +

                                       dims.gutterLeft[id] + "px; width: " + dims.gutterWidth[id] + "px"));

        }

    }

    if (ie_lt8) wrap.style.zIndex = 2;

    if (line.widgets && wrap != reuse) for (var i = 0, ws = line.widgets; i < ws.length; ++i) {

      var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");

      if (!widget.handleMouseEvents) node.ignoreEvents = true;

      positionLineWidget(widget, node, wrap, dims);

      if (widget.above)

        wrap.insertBefore(node, cm.options.lineNumbers && line.height != 0 ? gutterWrap : lineElement);

      else

        wrap.appendChild(node);

      signalLater(widget, "redraw");

    }

    return wrap;

  }



  function positionLineWidget(widget, node, wrap, dims) {

    if (widget.noHScroll) {

      (wrap.alignable || (wrap.alignable = [])).push(node);

      var width = dims.wrapperWidth;

      node.style.left = dims.fixedPos + "px";

      if (!widget.coverGutter) {

        width -= dims.gutterTotalWidth;

        node.style.paddingLeft = dims.gutterTotalWidth + "px";

      }

      node.style.width = width + "px";

    }

    if (widget.coverGutter) {

      node.style.zIndex = 5;

      node.style.position = "relative";

      if (!widget.noHScroll) node.style.marginLeft = -dims.gutterTotalWidth + "px";

    }

  }



  // SELECTION / CURSOR



  function updateSelection(cm) {

    var display = cm.display;

    var collapsed = posEq(cm.doc.sel.from, cm.doc.sel.to);

    if (collapsed || cm.options.showCursorWhenSelecting)

      updateSelectionCursor(cm);

    else

      display.cursor.style.display = display.otherCursor.style.display = "none";

    if (!collapsed)

      updateSelectionRange(cm);

    else

      display.selectionDiv.style.display = "none";



    // Move the hidden textarea near the cursor to prevent scrolling artifacts

    if (cm.options.moveInputWithCursor) {

      var headPos = cursorCoords(cm, cm.doc.sel.head, "div");

      var wrapOff = getRect(display.wrapper), lineOff = getRect(display.lineDiv);

      display.inputDiv.style.top = Math.max(0, Math.min(display.wrapper.clientHeight - 10,

                                                        headPos.top + lineOff.top - wrapOff.top)) + "px";

      display.inputDiv.style.left = Math.max(0, Math.min(display.wrapper.clientWidth - 10,

                                                         headPos.left + lineOff.left - wrapOff.left)) + "px";

    }

  }



  // No selection, plain cursor

  function updateSelectionCursor(cm) {

    var display = cm.display, pos = cursorCoords(cm, cm.doc.sel.head, "div");

    display.cursor.style.left = pos.left + "px";

    display.cursor.style.top = pos.top + "px";

    display.cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

    display.cursor.style.display = "";



    if (pos.other) {

      display.otherCursor.style.display = "";

      display.otherCursor.style.left = pos.other.left + "px";

      display.otherCursor.style.top = pos.other.top + "px";

      display.otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";

    } else { display.otherCursor.style.display = "none"; }

  }



  // Highlight selection

  function updateSelectionRange(cm) {

    var display = cm.display, doc = cm.doc, sel = cm.doc.sel;

    var fragment = document.createDocumentFragment();

    var clientWidth = display.lineSpace.offsetWidth, pl = paddingLeft(cm.display);



    function add(left, top, width, bottom) {

      if (top < 0) top = 0;

      fragment.appendChild(elt("div", null, "CodeMirror-selected", "position: absolute; left: " + left +

                               "px; top: " + top + "px; width: " + (width == null ? clientWidth - left : width) +

                               "px; height: " + (bottom - top) + "px"));

    }



    function drawForLine(line, fromArg, toArg) {

      var lineObj = getLine(doc, line);

      var lineLen = lineObj.text.length;

      var start, end;

      function coords(ch, bias) {

        return charCoords(cm, Pos(line, ch), "div", lineObj, bias);

      }



      iterateBidiSections(getOrder(lineObj), fromArg || 0, toArg == null ? lineLen : toArg, function(from, to, dir) {

        var leftPos = coords(from, "left"), rightPos, left, right;

        if (from == to) {

          rightPos = leftPos;

          left = right = leftPos.left;

        } else {

          rightPos = coords(to - 1, "right");

          if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }

          left = leftPos.left;

          right = rightPos.right;

        }

        if (fromArg == null && from == 0) left = pl;

        if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part

          add(left, leftPos.top, null, leftPos.bottom);

          left = pl;

          if (leftPos.bottom < rightPos.top) add(left, leftPos.bottom, null, rightPos.top);

        }

        if (toArg == null && to == lineLen) right = clientWidth;

        if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)

          start = leftPos;

        if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)

          end = rightPos;

        if (left < pl + 1) left = pl;

        add(left, rightPos.top, right - left, rightPos.bottom);

      });

      return {start: start, end: end};

    }



    if (sel.from.line == sel.to.line) {

      drawForLine(sel.from.line, sel.from.ch, sel.to.ch);

    } else {

      var fromLine = getLine(doc, sel.from.line), toLine = getLine(doc, sel.to.line);

      var singleVLine = visualLine(doc, fromLine) == visualLine(doc, toLine);

      var leftEnd = drawForLine(sel.from.line, sel.from.ch, singleVLine ? fromLine.text.length : null).end;

      var rightStart = drawForLine(sel.to.line, singleVLine ? 0 : null, sel.to.ch).start;

      if (singleVLine) {

        if (leftEnd.top < rightStart.top - 2) {

          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);

          add(pl, rightStart.top, rightStart.left, rightStart.bottom);

        } else {

          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);

        }

      }

      if (leftEnd.bottom < rightStart.top)

        add(pl, leftEnd.bottom, null, rightStart.top);

    }



    removeChildrenAndAdd(display.selectionDiv, fragment);

    display.selectionDiv.style.display = "";

  }



  // Cursor-blinking

  function restartBlink(cm) {

    if (!cm.state.focused) return;

    var display = cm.display;

    clearInterval(display.blinker);

    var on = true;

    display.cursor.style.visibility = display.otherCursor.style.visibility = "";

    if (cm.options.cursorBlinkRate > 0)

      display.blinker = setInterval(function() {

        display.cursor.style.visibility = display.otherCursor.style.visibility = (on = !on) ? "" : "hidden";

      }, cm.options.cursorBlinkRate);

  }



  // HIGHLIGHT WORKER



  function startWorker(cm, time) {

    if (cm.doc.mode.startState && cm.doc.frontier < cm.display.showingTo)

      cm.state.highlight.set(time, bind(highlightWorker, cm));

  }



  function highlightWorker(cm) {

    var doc = cm.doc;

    if (doc.frontier < doc.first) doc.frontier = doc.first;

    if (doc.frontier >= cm.display.showingTo) return;

    var end = +new Date + cm.options.workTime;

    var state = copyState(doc.mode, getStateBefore(cm, doc.frontier));

    var changed = [], prevChange;

    doc.iter(doc.frontier, Math.min(doc.first + doc.size, cm.display.showingTo + 500), function(line) {

      if (doc.frontier >= cm.display.showingFrom) { // Visible

        var oldStyles = line.styles;

        line.styles = highlightLine(cm, line, state);

        var ischange = !oldStyles || oldStyles.length != line.styles.length;

        for (var i = 0; !ischange && i < oldStyles.length; ++i) ischange = oldStyles[i] != line.styles[i];

        if (ischange) {

          if (prevChange && prevChange.end == doc.frontier) prevChange.end++;

          else changed.push(prevChange = {start: doc.frontier, end: doc.frontier + 1});

        }

        line.stateAfter = copyState(doc.mode, state);

      } else {

        processLine(cm, line, state);

        line.stateAfter = doc.frontier % 5 == 0 ? copyState(doc.mode, state) : null;

      }

      ++doc.frontier;

      if (+new Date > end) {

        startWorker(cm, cm.options.workDelay);

        return true;

      }

    });

    if (changed.length)

      operation(cm, function() {

        for (var i = 0; i < changed.length; ++i)

          regChange(this, changed[i].start, changed[i].end);

      })();

  }



  // Finds the line to start with when starting a parse. Tries to

  // find a line with a stateAfter, so that it can start with a

  // valid state. If that fails, it returns the line with the

  // smallest indentation, which tends to need the least context to

  // parse correctly.

  function findStartLine(cm, n, precise) {

    var minindent, minline, doc = cm.doc, maxScan = cm.doc.mode.innerMode ? 1000 : 100;

    for (var search = n, lim = n - maxScan; search > lim; --search) {

      if (search <= doc.first) return doc.first;

      var line = getLine(doc, search - 1);

      if (line.stateAfter && (!precise || search <= doc.frontier)) return search;

      var indented = countColumn(line.text, null, cm.options.tabSize);

      if (minline == null || minindent > indented) {

        minline = search - 1;

        minindent = indented;

      }

    }

    return minline;

  }



  function getStateBefore(cm, n, precise) {

    var doc = cm.doc, display = cm.display;

    if (!doc.mode.startState) return true;

    var pos = findStartLine(cm, n, precise), state = pos > doc.first && getLine(doc, pos-1).stateAfter;

    if (!state) state = startState(doc.mode);

    else state = copyState(doc.mode, state);

    doc.iter(pos, n, function(line) {

      processLine(cm, line, state);

      var save = pos == n - 1 || pos % 5 == 0 || pos >= display.showingFrom && pos < display.showingTo;

      line.stateAfter = save ? copyState(doc.mode, state) : null;

      ++pos;

    });

    return state;

  }



  // POSITION MEASUREMENT



  function paddingTop(display) {return display.lineSpace.offsetTop;}

  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight;}

  function paddingLeft(display) {

    var e = removeChildrenAndAdd(display.measure, elt("pre", null, null, "text-align: left")).appendChild(elt("span", "x"));

    return e.offsetLeft;

  }



  function measureChar(cm, line, ch, data, bias) {

    var dir = -1;

    data = data || measureLine(cm, line);



    for (var pos = ch;; pos += dir) {

      var r = data[pos];

      if (r) break;

      if (dir < 0 && pos == 0) dir = 1;

    }

    bias = pos > ch ? "left" : pos < ch ? "right" : bias;

    if (bias == "left" && r.leftSide) r = r.leftSide;

    else if (bias == "right" && r.rightSide) r = r.rightSide;

    return {left: pos < ch ? r.right : r.left,

            right: pos > ch ? r.left : r.right,

            top: r.top,

            bottom: r.bottom};

  }



  function findCachedMeasurement(cm, line) {

    var cache = cm.display.measureLineCache;

    for (var i = 0; i < cache.length; ++i) {

      var memo = cache[i];

      if (memo.text == line.text && memo.markedSpans == line.markedSpans &&

          cm.display.scroller.clientWidth == memo.width &&

          memo.classes == line.textClass + "|" + line.bgClass + "|" + line.wrapClass)

        return memo;

    }

  }



  function clearCachedMeasurement(cm, line) {

    var exists = findCachedMeasurement(cm, line);

    if (exists) exists.text = exists.measure = exists.markedSpans = null;

  }



  function measureLine(cm, line) {

    // First look in the cache

    var cached = findCachedMeasurement(cm, line);

    if (cached) return cached.measure;



    // Failing that, recompute and store result in cache

    var measure = measureLineInner(cm, line);

    var cache = cm.display.measureLineCache;

    var memo = {text: line.text, width: cm.display.scroller.clientWidth,

                markedSpans: line.markedSpans, measure: measure,

                classes: line.textClass + "|" + line.bgClass + "|" + line.wrapClass};

    if (cache.length == 16) cache[++cm.display.measureLineCachePos % 16] = memo;

    else cache.push(memo);

    return measure;

  }



  function measureLineInner(cm, line) {

    var display = cm.display, measure = emptyArray(line.text.length);

    var pre = lineContent(cm, line, measure, true);



    // IE does not cache element positions of inline elements between

    // calls to getBoundingClientRect. This makes the loop below,

    // which gathers the positions of all the characters on the line,

    // do an amount of layout work quadratic to the number of

    // characters. When line wrapping is off, we try to improve things

    // by first subdividing the line into a bunch of inline blocks, so

    // that IE can reuse most of the layout information from caches

    // for those blocks. This does interfere with line wrapping, so it

    // doesn't work when wrapping is on, but in that case the

    // situation is slightly better, since IE does cache line-wrapping

    // information and only recomputes per-line.

    if (ie && !ie_lt8 && !cm.options.lineWrapping && pre.childNodes.length > 100) {

      var fragment = document.createDocumentFragment();

      var chunk = 10, n = pre.childNodes.length;

      for (var i = 0, chunks = Math.ceil(n / chunk); i < chunks; ++i) {

        var wrap = elt("div", null, null, "display: inline-block");

        for (var j = 0; j < chunk && n; ++j) {

          wrap.appendChild(pre.firstChild);

          --n;

        }

        fragment.appendChild(wrap);

      }

      pre.appendChild(fragment);

    }



    removeChildrenAndAdd(display.measure, pre);



    var outer = getRect(display.lineDiv);

    var vranges = [], data = emptyArray(line.text.length), maxBot = pre.offsetHeight;

    // Work around an IE7/8 bug where it will sometimes have randomly

    // replaced our pre with a clone at this point.

    if (ie_lt9 && display.measure.first != pre)

      removeChildrenAndAdd(display.measure, pre);



    function measureRect(rect) {

      var top = rect.top - outer.top, bot = rect.bottom - outer.top;

      if (bot > maxBot) bot = maxBot;

      if (top < 0) top = 0;

      for (var i = vranges.length - 2; i >= 0; i -= 2) {

        var rtop = vranges[i], rbot = vranges[i+1];

        if (rtop > bot || rbot < top) continue;

        if (rtop <= top && rbot >= bot ||

            top <= rtop && bot >= rbot ||

            Math.min(bot, rbot) - Math.max(top, rtop) >= (bot - top) >> 1) {

          vranges[i] = Math.min(top, rtop);

          vranges[i+1] = Math.max(bot, rbot);

          break;

        }

      }

      if (i < 0) { i = vranges.length; vranges.push(top, bot); }

      return {left: rect.left - outer.left,

              right: rect.right - outer.left,

              top: i, bottom: null};

    }

    function finishRect(rect) {

      rect.bottom = vranges[rect.top+1];

      rect.top = vranges[rect.top];

    }



    for (var i = 0, cur; i < measure.length; ++i) if (cur = measure[i]) {

      var node = cur, rect = null;

      // A widget might wrap, needs special care

      if (/\bCodeMirror-widget\b/.test(cur.className) && cur.getClientRects) {

        if (cur.firstChild.nodeType == 1) node = cur.firstChild;

        var rects = node.getClientRects();

        if (rects.length > 1) {

          rect = data[i] = measureRect(rects[0]);

          rect.rightSide = measureRect(rects[rects.length - 1]);

        }

      }

      if (!rect) rect = data[i] = measureRect(getRect(node));

      if (cur.measureRight) rect.right = getRect(cur.measureRight).left;

      if (cur.leftSide) rect.leftSide = measureRect(getRect(cur.leftSide));

    }

    removeChildren(cm.display.measure);

    for (var i = 0, cur; i < data.length; ++i) if (cur = data[i]) {

      finishRect(cur);

      if (cur.leftSide) finishRect(cur.leftSide);

      if (cur.rightSide) finishRect(cur.rightSide);

    }

    return data;

  }



  function measureLineWidth(cm, line) {

    var hasBadSpan = false;

    if (line.markedSpans) for (var i = 0; i < line.markedSpans; ++i) {

      var sp = line.markedSpans[i];

      if (sp.collapsed && (sp.to == null || sp.to == line.text.length)) hasBadSpan = true;

    }

    var cached = !hasBadSpan && findCachedMeasurement(cm, line);

    if (cached) return measureChar(cm, line, line.text.length, cached.measure, "right").right;



    var pre = lineContent(cm, line, null, true);

    var end = pre.appendChild(zeroWidthElement(cm.display.measure));

    removeChildrenAndAdd(cm.display.measure, pre);

    return getRect(end).right - getRect(cm.display.lineDiv).left;

  }



  function clearCaches(cm) {

    cm.display.measureLineCache.length = cm.display.measureLineCachePos = 0;

    cm.display.cachedCharWidth = cm.display.cachedTextHeight = null;

    if (!cm.options.lineWrapping) cm.display.maxLineChanged = true;

    cm.display.lineNumChars = null;

  }



  function pageScrollX() { return window.pageXOffset || (document.documentElement || document.body).scrollLeft; }

  function pageScrollY() { return window.pageYOffset || (document.documentElement || document.body).scrollTop; }



  // Context is one of "line", "div" (display.lineDiv), "local"/null (editor), or "page"

  function intoCoordSystem(cm, lineObj, rect, context) {

    if (lineObj.widgets) for (var i = 0; i < lineObj.widgets.length; ++i) if (lineObj.widgets[i].above) {

      var size = widgetHeight(lineObj.widgets[i]);

      rect.top += size; rect.bottom += size;

    }

    if (context == "line") return rect;

    if (!context) context = "local";

    var yOff = heightAtLine(cm, lineObj);

    if (context == "local") yOff += paddingTop(cm.display);

    else yOff -= cm.display.viewOffset;

    if (context == "page" || context == "window") {

      var lOff = getRect(cm.display.lineSpace);

      yOff += lOff.top + (context == "window" ? 0 : pageScrollY());

      var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());

      rect.left += xOff; rect.right += xOff;

    }

    rect.top += yOff; rect.bottom += yOff;

    return rect;

  }



  // Context may be "window", "page", "div", or "local"/null

  // Result is in "div" coords

  function fromCoordSystem(cm, coords, context) {

    if (context == "div") return coords;

    var left = coords.left, top = coords.top;

    // First move into "page" coordinate system

    if (context == "page") {

      left -= pageScrollX();

      top -= pageScrollY();

    } else if (context == "local" || !context) {

      var localBox = getRect(cm.display.sizer);

      left += localBox.left;

      top += localBox.top;

    }



    var lineSpaceBox = getRect(cm.display.lineSpace);

    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top};

  }



  function charCoords(cm, pos, context, lineObj, bias) {

    if (!lineObj) lineObj = getLine(cm.doc, pos.line);

    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, null, bias), context);

  }



  function cursorCoords(cm, pos, context, lineObj, measurement) {

    lineObj = lineObj || getLine(cm.doc, pos.line);

    if (!measurement) measurement = measureLine(cm, lineObj);

    function get(ch, right) {

      var m = measureChar(cm, lineObj, ch, measurement, right ? "right" : "left");

      if (right) m.left = m.right; else m.right = m.left;

      return intoCoordSystem(cm, lineObj, m, context);

    }

    function getBidi(ch, partPos) {

      var part = order[partPos], right = part.level % 2;

      if (ch == bidiLeft(part) && partPos && part.level < order[partPos - 1].level) {

        part = order[--partPos];

        ch = bidiRight(part) - (part.level % 2 ? 0 : 1);

        right = true;

      } else if (ch == bidiRight(part) && partPos < order.length - 1 && part.level < order[partPos + 1].level) {

        part = order[++partPos];

        ch = bidiLeft(part) - part.level % 2;

        right = false;

      }

      if (right && ch == part.to && ch > part.from) return get(ch - 1);

      return get(ch, right);

    }

    var order = getOrder(lineObj), ch = pos.ch;

    if (!order) return get(ch);

    var partPos = getBidiPartAt(order, ch);

    var val = getBidi(ch, partPos);

    if (bidiOther != null) val.other = getBidi(ch, bidiOther);

    return val;

  }



  function PosWithInfo(line, ch, outside, xRel) {

    var pos = new Pos(line, ch);

    pos.xRel = xRel;

    if (outside) pos.outside = true;

    return pos;

  }



  // Coords must be lineSpace-local

  function coordsChar(cm, x, y) {

    var doc = cm.doc;

    y += cm.display.viewOffset;

    if (y < 0) return PosWithInfo(doc.first, 0, true, -1);

    var lineNo = lineAtHeight(doc, y), last = doc.first + doc.size - 1;

    if (lineNo > last)

      return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, true, 1);

    if (x < 0) x = 0;



    for (;;) {

      var lineObj = getLine(doc, lineNo);

      var found = coordsCharInner(cm, lineObj, lineNo, x, y);

      var merged = collapsedSpanAtEnd(lineObj);

      var mergedPos = merged && merged.find();

      if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))

        lineNo = mergedPos.to.line;

      else

        return found;

    }

  }



  function coordsCharInner(cm, lineObj, lineNo, x, y) {

    var innerOff = y - heightAtLine(cm, lineObj);

    var wrongLine = false, adjust = 2 * cm.display.wrapper.clientWidth;

    var measurement = measureLine(cm, lineObj);



    function getX(ch) {

      var sp = cursorCoords(cm, Pos(lineNo, ch), "line",

                            lineObj, measurement);

      wrongLine = true;

      if (innerOff > sp.bottom) return sp.left - adjust;

      else if (innerOff < sp.top) return sp.left + adjust;

      else wrongLine = false;

      return sp.left;

    }



    var bidi = getOrder(lineObj), dist = lineObj.text.length;

    var from = lineLeft(lineObj), to = lineRight(lineObj);

    var fromX = getX(from), fromOutside = wrongLine, toX = getX(to), toOutside = wrongLine;



    if (x > toX) return PosWithInfo(lineNo, to, toOutside, 1);

    // Do a binary search between these bounds.

    for (;;) {

      if (bidi ? to == from || to == moveVisually(lineObj, from, 1) : to - from <= 1) {

        var ch = x < fromX || x - fromX <= toX - x ? from : to;

        var xDiff = x - (ch == from ? fromX : toX);

        while (isExtendingChar.test(lineObj.text.charAt(ch))) ++ch;

        var pos = PosWithInfo(lineNo, ch, ch == from ? fromOutside : toOutside,

                              xDiff < 0 ? -1 : xDiff ? 1 : 0);

        return pos;

      }

      var step = Math.ceil(dist / 2), middle = from + step;

      if (bidi) {

        middle = from;

        for (var i = 0; i < step; ++i) middle = moveVisually(lineObj, middle, 1);

      }

      var middleX = getX(middle);

      if (middleX > x) {to = middle; toX = middleX; if (toOutside = wrongLine) toX += 1000; dist = step;}

      else {from = middle; fromX = middleX; fromOutside = wrongLine; dist -= step;}

    }

  }



  var measureText;

  function textHeight(display) {

    if (display.cachedTextHeight != null) return display.cachedTextHeight;

    if (measureText == null) {

      measureText = elt("pre");

      // Measure a bunch of lines, for browsers that compute

      // fractional heights.

      for (var i = 0; i < 49; ++i) {

        measureText.appendChild(document.createTextNode("x"));

        measureText.appendChild(elt("br"));

      }

      measureText.appendChild(document.createTextNode("x"));

    }

    removeChildrenAndAdd(display.measure, measureText);

    var height = measureText.offsetHeight / 50;

    if (height > 3) display.cachedTextHeight = height;

    removeChildren(display.measure);

    return height || 1;

  }



  function charWidth(display) {

    if (display.cachedCharWidth != null) return display.cachedCharWidth;

    var anchor = elt("span", "x");

    var pre = elt("pre", [anchor]);

    removeChildrenAndAdd(display.measure, pre);

    var width = anchor.offsetWidth;

    if (width > 2) display.cachedCharWidth = width;

    return width || 10;

  }



  // OPERATIONS



  // Operations are used to wrap changes in such a way that each

  // change won't have to update the cursor and display (which would

  // be awkward, slow, and error-prone), but instead updates are

  // batched and then all combined and executed at once.



  var nextOpId = 0;

  function startOperation(cm) {

    cm.curOp = {

      // An array of ranges of lines that have to be updated. See

      // updateDisplay.

      changes: [],

      forceUpdate: false,

      updateInput: null,

      userSelChange: null,

      textChanged: null,

      selectionChanged: false,

      cursorActivity: false,

      updateMaxLine: false,

      updateScrollPos: false,

      id: ++nextOpId

    };

    if (!delayedCallbackDepth++) delayedCallbacks = [];

  }



  function endOperation(cm) {

    var op = cm.curOp, doc = cm.doc, display = cm.display;

    cm.curOp = null;



    if (op.updateMaxLine) computeMaxLength(cm);

    if (display.maxLineChanged && !cm.options.lineWrapping && display.maxLine) {

      var width = measureLineWidth(cm, display.maxLine);

      display.sizer.style.minWidth = Math.max(0, width + 3 + scrollerCutOff) + "px";

      display.maxLineChanged = false;

      var maxScrollLeft = Math.max(0, display.sizer.offsetLeft + display.sizer.offsetWidth - display.scroller.clientWidth);

      if (maxScrollLeft < doc.scrollLeft && !op.updateScrollPos)

        setScrollLeft(cm, Math.min(display.scroller.scrollLeft, maxScrollLeft), true);

    }

    var newScrollPos, updated;

    if (op.updateScrollPos) {

      newScrollPos = op.updateScrollPos;

    } else if (op.selectionChanged && display.scroller.clientHeight) { // don't rescroll if not visible

      var coords = cursorCoords(cm, doc.sel.head);

      newScrollPos = calculateScrollPos(cm, coords.left, coords.top, coords.left, coords.bottom);

    }

    if (op.changes.length || op.forceUpdate || newScrollPos && newScrollPos.scrollTop != null) {

      updated = updateDisplay(cm, op.changes, newScrollPos && newScrollPos.scrollTop, op.forceUpdate);

      if (cm.display.scroller.offsetHeight) cm.doc.scrollTop = cm.display.scroller.scrollTop;

    }

    if (!updated && op.selectionChanged) updateSelection(cm);

    if (op.updateScrollPos) {

      display.scroller.scrollTop = display.scrollbarV.scrollTop = doc.scrollTop = newScrollPos.scrollTop;

      display.scroller.scrollLeft = display.scrollbarH.scrollLeft = doc.scrollLeft = newScrollPos.scrollLeft;

      alignHorizontally(cm);

      if (op.scrollToPos)

        scrollPosIntoView(cm, clipPos(cm.doc, op.scrollToPos), op.scrollToPosMargin);

    } else if (newScrollPos) {

      scrollCursorIntoView(cm);

    }

    if (op.selectionChanged) restartBlink(cm);



    if (cm.state.focused && op.updateInput)

      resetInput(cm, op.userSelChange);



    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;

    if (hidden) for (var i = 0; i < hidden.length; ++i)

      if (!hidden[i].lines.length) signal(hidden[i], "hide");

    if (unhidden) for (var i = 0; i < unhidden.length; ++i)

      if (unhidden[i].lines.length) signal(unhidden[i], "unhide");



    var delayed;

    if (!--delayedCallbackDepth) {

      delayed = delayedCallbacks;

      delayedCallbacks = null;

    }

    if (op.textChanged)

      signal(cm, "change", cm, op.textChanged);

    if (op.cursorActivity) signal(cm, "cursorActivity", cm);

    if (delayed) for (var i = 0; i < delayed.length; ++i) delayed[i]();

  }



  // Wraps a function in an operation. Returns the wrapped function.

  function operation(cm1, f) {

    return function() {

      var cm = cm1 || this, withOp = !cm.curOp;

      if (withOp) startOperation(cm);

      try { var result = f.apply(cm, arguments); }

      finally { if (withOp) endOperation(cm); }

      return result;

    };

  }

  function docOperation(f) {

    return function() {

      var withOp = this.cm && !this.cm.curOp, result;

      if (withOp) startOperation(this.cm);

      try { result = f.apply(this, arguments); }

      finally { if (withOp) endOperation(this.cm); }

      return result;

    };

  }

  function runInOp(cm, f) {

    var withOp = !cm.curOp, result;

    if (withOp) startOperation(cm);

    try { result = f(); }

    finally { if (withOp) endOperation(cm); }

    return result;

  }



  function regChange(cm, from, to, lendiff) {

    if (from == null) from = cm.doc.first;

    if (to == null) to = cm.doc.first + cm.doc.size;

    cm.curOp.changes.push({from: from, to: to, diff: lendiff});

  }



  // INPUT HANDLING



  function slowPoll(cm) {

    if (cm.display.pollingFast) return;

    cm.display.poll.set(cm.options.pollInterval, function() {

      readInput(cm);

      if (cm.state.focused) slowPoll(cm);

    });

  }



  function fastPoll(cm) {

    var missed = false;

    cm.display.pollingFast = true;

    function p() {

      var changed = readInput(cm);

      if (!changed && !missed) {missed = true; cm.display.poll.set(60, p);}

      else {cm.display.pollingFast = false; slowPoll(cm);}

    }

    cm.display.poll.set(20, p);

  }



  // prevInput is a hack to work with IME. If we reset the textarea

  // on every change, that breaks IME. So we look for changes

  // compared to the previous content instead. (Modern browsers have

  // events that indicate IME taking place, but these are not widely

  // supported or compatible enough yet to rely on.)

  function readInput(cm) {

    var input = cm.display.input, prevInput = cm.display.prevInput, doc = cm.doc, sel = doc.sel;

    if (!cm.state.focused || hasSelection(input) || isReadOnly(cm) || cm.state.disableInput) return false;

    if (cm.state.pasteIncoming && cm.state.fakedLastChar) {

      input.value = input.value.substring(0, input.value.length - 1);

      cm.state.fakedLastChar = false;

    }

    var text = input.value;

    if (text == prevInput && posEq(sel.from, sel.to)) return false;

    if (ie && !ie_lt9 && cm.display.inputHasSelection === text) {

      resetInput(cm, true);

      return false;

    }



    var withOp = !cm.curOp;

    if (withOp) startOperation(cm);

    sel.shift = false;

    var same = 0, l = Math.min(prevInput.length, text.length);

    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) ++same;

    var from = sel.from, to = sel.to;

    if (same < prevInput.length)

      from = Pos(from.line, from.ch - (prevInput.length - same));

    else if (cm.state.overwrite && posEq(from, to) && !cm.state.pasteIncoming)

      to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + (text.length - same)));



    var updateInput = cm.curOp.updateInput;

    var changeEvent = {from: from, to: to, text: splitLines(text.slice(same)),

                       origin: cm.state.pasteIncoming ? "paste" : "+input"};

    makeChange(cm.doc, changeEvent, "end");

    cm.curOp.updateInput = updateInput;

    signalLater(cm, "inputRead", cm, changeEvent);



    if (text.length > 1000 || text.indexOf("\n") > -1) input.value = cm.display.prevInput = "";

    else cm.display.prevInput = text;

    if (withOp) endOperation(cm);

    cm.state.pasteIncoming = false;

    return true;

  }



  function resetInput(cm, user) {

    var minimal, selected, doc = cm.doc;

    if (!posEq(doc.sel.from, doc.sel.to)) {

      cm.display.prevInput = "";

      minimal = hasCopyEvent &&

        (doc.sel.to.line - doc.sel.from.line > 100 || (selected = cm.getSelection()).length > 1000);

      var content = minimal ? "-" : selected || cm.getSelection();

      cm.display.input.value = content;

      if (cm.state.focused) selectInput(cm.display.input);

      if (ie && !ie_lt9) cm.display.inputHasSelection = content;

    } else if (user) {

      cm.display.prevInput = cm.display.input.value = "";

      if (ie && !ie_lt9) cm.display.inputHasSelection = null;

    }

    cm.display.inaccurateSelection = minimal;

  }



  function focusInput(cm) {

    if (cm.options.readOnly != "nocursor" && (!mobile || document.activeElement != cm.display.input))

      cm.display.input.focus();

  }



  function isReadOnly(cm) {

    return cm.options.readOnly || cm.doc.cantEdit;

  }



  // EVENT HANDLERS



  function registerEventHandlers(cm) {

    var d = cm.display;

    on(d.scroller, "mousedown", operation(cm, onMouseDown));

    if (ie)

      on(d.scroller, "dblclick", operation(cm, function(e) {

        if (signalDOMEvent(cm, e)) return;

        var pos = posFromMouse(cm, e);

        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) return;

        e_preventDefault(e);

        var word = findWordAt(getLine(cm.doc, pos.line).text, pos);

        extendSelection(cm.doc, word.from, word.to);

      }));

    else

      on(d.scroller, "dblclick", function(e) { signalDOMEvent(cm, e) || e_preventDefault(e); });

    on(d.lineSpace, "selectstart", function(e) {

      if (!eventInWidget(d, e)) e_preventDefault(e);

    });

    // Gecko browsers fire contextmenu *after* opening the menu, at

    // which point we can't mess with it anymore. Context menu is

    // handled in onMouseDown for Gecko.

    if (!captureMiddleClick) on(d.scroller, "contextmenu", function(e) {onContextMenu(cm, e);});



    on(d.scroller, "scroll", function() {

      if (d.scroller.clientHeight) {

        setScrollTop(cm, d.scroller.scrollTop);

        setScrollLeft(cm, d.scroller.scrollLeft, true);

        signal(cm, "scroll", cm);

      }

    });

    on(d.scrollbarV, "scroll", function() {

      if (d.scroller.clientHeight) setScrollTop(cm, d.scrollbarV.scrollTop);

    });

    on(d.scrollbarH, "scroll", function() {

      if (d.scroller.clientHeight) setScrollLeft(cm, d.scrollbarH.scrollLeft);

    });



    on(d.scroller, "mousewheel", function(e){onScrollWheel(cm, e);});

    on(d.scroller, "DOMMouseScroll", function(e){onScrollWheel(cm, e);});



    function reFocus() { if (cm.state.focused) setTimeout(bind(focusInput, cm), 0); }

    on(d.scrollbarH, "mousedown", reFocus);

    on(d.scrollbarV, "mousedown", reFocus);

    // Prevent wrapper from ever scrolling

    on(d.wrapper, "scroll", function() { d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });



    var resizeTimer;

    function onResize() {

      if (resizeTimer == null) resizeTimer = setTimeout(function() {

        resizeTimer = null;

        // Might be a text scaling operation, clear size caches.

        d.cachedCharWidth = d.cachedTextHeight = knownScrollbarWidth = null;

        clearCaches(cm);

        runInOp(cm, bind(regChange, cm));

      }, 100);

    }

    on(window, "resize", onResize);

    // Above handler holds on to the editor and its data structures.

    // Here we poll to unregister it when the editor is no longer in

    // the document, so that it can be garbage-collected.

    function unregister() {

      for (var p = d.wrapper.parentNode; p && p != document.body; p = p.parentNode) {}

      if (p) setTimeout(unregister, 5000);

      else off(window, "resize", onResize);

    }

    setTimeout(unregister, 5000);



    on(d.input, "keyup", operation(cm, function(e) {

      if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;

      if (e.keyCode == 16) cm.doc.sel.shift = false;

    }));

    on(d.input, "input", bind(fastPoll, cm));

    on(d.input, "keydown", operation(cm, onKeyDown));

    on(d.input, "keypress", operation(cm, onKeyPress));

    on(d.input, "focus", bind(onFocus, cm));

    on(d.input, "blur", bind(onBlur, cm));



    function drag_(e) {

      if (signalDOMEvent(cm, e) || cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))) return;

      e_stop(e);

    }

    if (cm.options.dragDrop) {

      on(d.scroller, "dragstart", function(e){onDragStart(cm, e);});

      on(d.scroller, "dragenter", drag_);

      on(d.scroller, "dragover", drag_);

      on(d.scroller, "drop", operation(cm, onDrop));

    }

    on(d.scroller, "paste", function(e) {

      if (eventInWidget(d, e)) return;

      focusInput(cm);

      fastPoll(cm);

    });

    on(d.input, "paste", function() {

      // Workaround for webkit bug https://bugs.webkit.org/show_bug.cgi?id=90206

      // Add a char to the end of textarea before paste occur so that

      // selection doesn't span to the end of textarea.

      if (webkit && !cm.state.fakedLastChar && !(new Date - cm.state.lastMiddleDown < 200)) {

        var start = d.input.selectionStart, end = d.input.selectionEnd;

        d.input.value += "$";

        d.input.selectionStart = start;

        d.input.selectionEnd = end;

        cm.state.fakedLastChar = true;

      }

      cm.state.pasteIncoming = true;

      fastPoll(cm);

    });



    function prepareCopy() {

      if (d.inaccurateSelection) {

        d.prevInput = "";

        d.inaccurateSelection = false;

        d.input.value = cm.getSelection();

        selectInput(d.input);

      }

    }

    on(d.input, "cut", prepareCopy);

    on(d.input, "copy", prepareCopy);



    // Needed to handle Tab key in KHTML

    if (khtml) on(d.sizer, "mouseup", function() {

        if (document.activeElement == d.input) d.input.blur();

        focusInput(cm);

    });

  }



  function eventInWidget(display, e) {

    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {

      if (!n || n.ignoreEvents || n.parentNode == display.sizer && n != display.mover) return true;

    }

  }



  function posFromMouse(cm, e, liberal) {

    var display = cm.display;

    if (!liberal) {

      var target = e_target(e);

      if (target == display.scrollbarH || target == display.scrollbarH.firstChild ||

          target == display.scrollbarV || target == display.scrollbarV.firstChild ||

          target == display.scrollbarFiller || target == display.gutterFiller) return null;

    }

    var x, y, space = getRect(display.lineSpace);

    // Fails unpredictably on IE[67] when mouse is dragged around quickly.

    try { x = e.clientX; y = e.clientY; } catch (e) { return null; }

    return coordsChar(cm, x - space.left, y - space.top);

  }



  var lastClick, lastDoubleClick;

  function onMouseDown(e) {

    if (signalDOMEvent(this, e)) return;

    var cm = this, display = cm.display, doc = cm.doc, sel = doc.sel;

    sel.shift = e.shiftKey;



    if (eventInWidget(display, e)) {

      if (!webkit) {

        display.scroller.draggable = false;

        setTimeout(function(){display.scroller.draggable = true;}, 100);

      }

      return;

    }

    if (clickInGutter(cm, e)) return;

    var start = posFromMouse(cm, e);



    switch (e_button(e)) {

    case 3:

      if (captureMiddleClick) onContextMenu.call(cm, cm, e);

      return;

    case 2:

      if (webkit) cm.state.lastMiddleDown = +new Date;

      if (start) extendSelection(cm.doc, start);

      setTimeout(bind(focusInput, cm), 20);

      e_preventDefault(e);

      return;

    }

    // For button 1, if it was clicked inside the editor

    // (posFromMouse returning non-null), we have to adjust the

    // selection.

    if (!start) {if (e_target(e) == display.scroller) e_preventDefault(e); return;}



    if (!cm.state.focused) onFocus(cm);



    var now = +new Date, type = "single";

    if (lastDoubleClick && lastDoubleClick.time > now - 400 && posEq(lastDoubleClick.pos, start)) {

      type = "triple";

      e_preventDefault(e);

      setTimeout(bind(focusInput, cm), 20);

      selectLine(cm, start.line);

    } else if (lastClick && lastClick.time > now - 400 && posEq(lastClick.pos, start)) {

      type = "double";

      lastDoubleClick = {time: now, pos: start};

      e_preventDefault(e);

      var word = findWordAt(getLine(doc, start.line).text, start);

      extendSelection(cm.doc, word.from, word.to);

    } else { lastClick = {time: now, pos: start}; }



    var last = start;

    if (cm.options.dragDrop && dragAndDrop && !isReadOnly(cm) && !posEq(sel.from, sel.to) &&

        !posLess(start, sel.from) && !posLess(sel.to, start) && type == "single") {

      var dragEnd = operation(cm, function(e2) {

        if (webkit) display.scroller.draggable = false;

        cm.state.draggingText = false;

        off(document, "mouseup", dragEnd);

        off(display.scroller, "drop", dragEnd);

        if (Math.abs(e.clientX - e2.clientX) + Math.abs(e.clientY - e2.clientY) < 10) {

          e_preventDefault(e2);

          extendSelection(cm.doc, start);

          focusInput(cm);

        }

      });

      // Let the drag handler handle this.

      if (webkit) display.scroller.draggable = true;

      cm.state.draggingText = dragEnd;

      // IE's approach to draggable

      if (display.scroller.dragDrop) display.scroller.dragDrop();

      on(document, "mouseup", dragEnd);

      on(display.scroller, "drop", dragEnd);

      return;

    }

    e_preventDefault(e);

    if (type == "single") extendSelection(cm.doc, clipPos(doc, start));



    var startstart = sel.from, startend = sel.to, lastPos = start;



    function doSelect(cur) {

      if (posEq(lastPos, cur)) return;

      lastPos = cur;



      if (type == "single") {

        extendSelection(cm.doc, clipPos(doc, start), cur);

        return;

      }



      startstart = clipPos(doc, startstart);

      startend = clipPos(doc, startend);

      if (type == "double") {

        var word = findWordAt(getLine(doc, cur.line).text, cur);

        if (posLess(cur, startstart)) extendSelection(cm.doc, word.from, startend);

        else extendSelection(cm.doc, startstart, word.to);

      } else if (type == "triple") {

        if (posLess(cur, startstart)) extendSelection(cm.doc, startend, clipPos(doc, Pos(cur.line, 0)));

        else extendSelection(cm.doc, startstart, clipPos(doc, Pos(cur.line + 1, 0)));

      }

    }



    var editorSize = getRect(display.wrapper);

    // Used to ensure timeout re-tries don't fire when another extend

    // happened in the meantime (clearTimeout isn't reliable -- at

    // least on Chrome, the timeouts still happen even when cleared,

    // if the clear happens after their scheduled firing time).

    var counter = 0;



    function extend(e) {

      var curCount = ++counter;

      var cur = posFromMouse(cm, e, true);

      if (!cur) return;

      if (!posEq(cur, last)) {

        if (!cm.state.focused) onFocus(cm);

        last = cur;

        doSelect(cur);

        var visible = visibleLines(display, doc);

        if (cur.line >= visible.to || cur.line < visible.from)

          setTimeout(operation(cm, function(){if (counter == curCount) extend(e);}), 150);

      } else {

        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;

        if (outside) setTimeout(operation(cm, function() {

          if (counter != curCount) return;

          display.scroller.scrollTop += outside;

          extend(e);

        }), 50);

      }

    }



    function done(e) {

      counter = Infinity;

      e_preventDefault(e);

      focusInput(cm);

      off(document, "mousemove", move);

      off(document, "mouseup", up);

    }



    var move = operation(cm, function(e) {

      if (!ie && !e_button(e)) done(e);

      else extend(e);

    });

    var up = operation(cm, done);

    on(document, "mousemove", move);

    on(document, "mouseup", up);

  }



  function clickInGutter(cm, e) {

    var display = cm.display;

    try { var mX = e.clientX, mY = e.clientY; }

    catch(e) { return false; }



    if (mX >= Math.floor(getRect(display.gutters).right)) return false;

    e_preventDefault(e);

    if (!hasHandler(cm, "gutterClick")) return true;



    var lineBox = getRect(display.lineDiv);

    if (mY > lineBox.bottom) return true;

    mY -= lineBox.top - display.viewOffset;



    for (var i = 0; i < cm.options.gutters.length; ++i) {

      var g = display.gutters.childNodes[i];

      if (g && getRect(g).right >= mX) {

        var line = lineAtHeight(cm.doc, mY);

        var gutter = cm.options.gutters[i];

        signalLater(cm, "gutterClick", cm, line, gutter, e);

        break;

      }

    }

    return true;

  }



  // Kludge to work around strange IE behavior where it'll sometimes

  // re-fire a series of drag-related events right after the drop (#1551)

  var lastDrop = 0;



  function onDrop(e) {

    var cm = this;

    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e) || (cm.options.onDragEvent && cm.options.onDragEvent(cm, addStop(e))))

      return;

    e_preventDefault(e);

    if (ie) lastDrop = +new Date;

    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;

    if (!pos || isReadOnly(cm)) return;

    if (files && files.length && window.FileReader && window.File) {

      var n = files.length, text = Array(n), read = 0;

      var loadFile = function(file, i) {

        var reader = new FileReader;

        reader.onload = function() {

          text[i] = reader.result;

          if (++read == n) {

            pos = clipPos(cm.doc, pos);

            makeChange(cm.doc, {from: pos, to: pos, text: splitLines(text.join("\n")), origin: "paste"}, "around");

          }

        };

        reader.readAsText(file);

      };

      for (var i = 0; i < n; ++i) loadFile(files[i], i);

    } else {

      // Don't do a replace if the drop happened inside of the selected text.

      if (cm.state.draggingText && !(posLess(pos, cm.doc.sel.from) || posLess(cm.doc.sel.to, pos))) {

        cm.state.draggingText(e);

        // Ensure the editor is re-focused

        setTimeout(bind(focusInput, cm), 20);

        return;

      }

      try {

        var text = e.dataTransfer.getData("Text");

        if (text) {

          var curFrom = cm.doc.sel.from, curTo = cm.doc.sel.to;

          setSelection(cm.doc, pos, pos);

          if (cm.state.draggingText) replaceRange(cm.doc, "", curFrom, curTo, "paste");

          cm.replaceSelection(text, null, "paste");

          focusInput(cm);

          onFocus(cm);

        }

      }

      catch(e){}

    }

  }



  function onDragStart(cm, e) {

    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return; }

    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) return;



    var txt = cm.getSelection();

    e.dataTransfer.setData("Text", txt);



    // Use dummy image instead of default browsers image.

    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.

    if (e.dataTransfer.setDragImage && !safari) {

      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");

      if (opera) {

        img.width = img.height = 1;

        cm.display.wrapper.appendChild(img);

        // Force a relayout, or Opera won't use our image for some obscure reason

        img._top = img.offsetTop;

      }

      e.dataTransfer.setDragImage(img, 0, 0);

      if (opera) img.parentNode.removeChild(img);

    }

  }



  function setScrollTop(cm, val) {

    if (Math.abs(cm.doc.scrollTop - val) < 2) return;

    cm.doc.scrollTop = val;

    if (!gecko) updateDisplay(cm, [], val);

    if (cm.display.scroller.scrollTop != val) cm.display.scroller.scrollTop = val;

    if (cm.display.scrollbarV.scrollTop != val) cm.display.scrollbarV.scrollTop = val;

    if (gecko) updateDisplay(cm, []);

    startWorker(cm, 100);

  }

  function setScrollLeft(cm, val, isScroller) {

    if (isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) return;

    val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);

    cm.doc.scrollLeft = val;

    alignHorizontally(cm);

    if (cm.display.scroller.scrollLeft != val) cm.display.scroller.scrollLeft = val;

    if (cm.display.scrollbarH.scrollLeft != val) cm.display.scrollbarH.scrollLeft = val;

  }



  // Since the delta values reported on mouse wheel events are

  // unstandardized between browsers and even browser versions, and

  // generally horribly unpredictable, this code starts by measuring

  // the scroll effect that the first few mouse wheel events have,

  // and, from that, detects the way it can convert deltas to pixel

  // offsets afterwards.

  //

  // The reason we want to know the amount a wheel event will scroll

  // is that it gives us a chance to update the display before the

  // actual scrolling happens, reducing flickering.



  var wheelSamples = 0, wheelPixelsPerUnit = null;

  // Fill in a browser-detected starting value on browsers where we

  // know one. These don't have to be accurate -- the result of them

  // being wrong would just be a slight flicker on the first wheel

  // scroll (if it is large enough).

  if (ie) wheelPixelsPerUnit = -.53;

  else if (gecko) wheelPixelsPerUnit = 15;

  else if (chrome) wheelPixelsPerUnit = -.7;

  else if (safari) wheelPixelsPerUnit = -1/3;



  function onScrollWheel(cm, e) {

    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;

    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) dx = e.detail;

    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) dy = e.detail;

    else if (dy == null) dy = e.wheelDelta;



    var display = cm.display, scroll = display.scroller;

    // Quit if there's nothing to scroll here

    if (!(dx && scroll.scrollWidth > scroll.clientWidth ||

          dy && scroll.scrollHeight > scroll.clientHeight)) return;



    // Webkit browsers on OS X abort momentum scrolls when the target

    // of the scroll event is removed from the scrollable element.

    // This hack (see related code in patchDisplay) makes sure the

    // element is kept around.

    if (dy && mac && webkit) {

      for (var cur = e.target; cur != scroll; cur = cur.parentNode) {

        if (cur.lineObj) {

          cm.display.currentWheelTarget = cur;

          break;

        }

      }

    }



    // On some browsers, horizontal scrolling will cause redraws to

    // happen before the gutter has been realigned, causing it to

    // wriggle around in a most unseemly way. When we have an

    // estimated pixels/delta value, we just handle horizontal

    // scrolling entirely here. It'll be slightly off from native, but

    // better than glitching out.

    if (dx && !gecko && !opera && wheelPixelsPerUnit != null) {

      if (dy)

        setScrollTop(cm, Math.max(0, Math.min(scroll.scrollTop + dy * wheelPixelsPerUnit, scroll.scrollHeight - scroll.clientHeight)));

      setScrollLeft(cm, Math.max(0, Math.min(scroll.scrollLeft + dx * wheelPixelsPerUnit, scroll.scrollWidth - scroll.clientWidth)));

      e_preventDefault(e);

      display.wheelStartX = null; // Abort measurement, if in progress

      return;

    }



    if (dy && wheelPixelsPerUnit != null) {

      var pixels = dy * wheelPixelsPerUnit;

      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;

      if (pixels < 0) top = Math.max(0, top + pixels - 50);

      else bot = Math.min(cm.doc.height, bot + pixels + 50);

      updateDisplay(cm, [], {top: top, bottom: bot});

    }



    if (wheelSamples < 20) {

      if (display.wheelStartX == null) {

        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;

        display.wheelDX = dx; display.wheelDY = dy;

        setTimeout(function() {

          if (display.wheelStartX == null) return;

          var movedX = scroll.scrollLeft - display.wheelStartX;

          var movedY = scroll.scrollTop - display.wheelStartY;

          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||

            (movedX && display.wheelDX && movedX / display.wheelDX);

          display.wheelStartX = display.wheelStartY = null;

          if (!sample) return;

          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);

          ++wheelSamples;

        }, 200);

      } else {

        display.wheelDX += dx; display.wheelDY += dy;

      }

    }

  }



  function doHandleBinding(cm, bound, dropShift) {

    if (typeof bound == "string") {

      bound = commands[bound];

      if (!bound) return false;

    }

    // Ensure previous input has been read, so that the handler sees a

    // consistent view of the document

    if (cm.display.pollingFast && readInput(cm)) cm.display.pollingFast = false;

    var doc = cm.doc, prevShift = doc.sel.shift, done = false;

    try {

      if (isReadOnly(cm)) cm.state.suppressEdits = true;

      if (dropShift) doc.sel.shift = false;

      done = bound(cm) != Pass;

    } finally {

      doc.sel.shift = prevShift;

      cm.state.suppressEdits = false;

    }

    return done;

  }



  function allKeyMaps(cm) {

    var maps = cm.state.keyMaps.slice(0);

    if (cm.options.extraKeys) maps.push(cm.options.extraKeys);

    maps.push(cm.options.keyMap);

    return maps;

  }



  var maybeTransition;

  function handleKeyBinding(cm, e) {

    // Handle auto keymap transitions

    var startMap = getKeyMap(cm.options.keyMap), next = startMap.auto;

    clearTimeout(maybeTransition);

    if (next && !isModifierKey(e)) maybeTransition = setTimeout(function() {

      if (getKeyMap(cm.options.keyMap) == startMap) {

        cm.options.keyMap = (next.call ? next.call(null, cm) : next);

        keyMapChanged(cm);

      }

    }, 50);



    var name = keyName(e, true), handled = false;

    if (!name) return false;

    var keymaps = allKeyMaps(cm);



    if (e.shiftKey) {

      // First try to resolve full name (including 'Shift-'). Failing

      // that, see if there is a cursor-motion command (starting with

      // 'go') bound to the keyname without 'Shift-'.

      handled = lookupKey("Shift-" + name, keymaps, function(b) {return doHandleBinding(cm, b, true);})

             || lookupKey(name, keymaps, function(b) {

                  if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)

                    return doHandleBinding(cm, b);

                });

    } else {

      handled = lookupKey(name, keymaps, function(b) { return doHandleBinding(cm, b); });

    }



    if (handled) {

      e_preventDefault(e);

      restartBlink(cm);

      if (ie_lt9) { e.oldKeyCode = e.keyCode; e.keyCode = 0; }

      signalLater(cm, "keyHandled", cm, name, e);

    }

    return handled;

  }



  function handleCharBinding(cm, e, ch) {

    var handled = lookupKey("'" + ch + "'", allKeyMaps(cm),

                            function(b) { return doHandleBinding(cm, b, true); });

    if (handled) {

      e_preventDefault(e);

      restartBlink(cm);

      signalLater(cm, "keyHandled", cm, "'" + ch + "'", e);

    }

    return handled;

  }



  var lastStoppedKey = null;

  function onKeyDown(e) {

    var cm = this;

    if (!cm.state.focused) onFocus(cm);

    if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;

    if (ie && e.keyCode == 27) e.returnValue = false;

    var code = e.keyCode;

    // IE does strange things with escape.

    cm.doc.sel.shift = code == 16 || e.shiftKey;

    // First give onKeyEvent option a chance to handle this.

    var handled = handleKeyBinding(cm, e);

    if (opera) {

      lastStoppedKey = handled ? code : null;

      // Opera has no cut event... we try to at least catch the key combo

      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))

        cm.replaceSelection("");

    }

  }



  function onKeyPress(e) {

    var cm = this;

    if (signalDOMEvent(cm, e) || cm.options.onKeyEvent && cm.options.onKeyEvent(cm, addStop(e))) return;

    var keyCode = e.keyCode, charCode = e.charCode;

    if (opera && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return;}

    if (((opera && (!e.which || e.which < 10)) || khtml) && handleKeyBinding(cm, e)) return;

    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);

    if (this.options.electricChars && this.doc.mode.electricChars &&

        this.options.smartIndent && !isReadOnly(this) &&

        this.doc.mode.electricChars.indexOf(ch) > -1)

      setTimeout(operation(cm, function() {indentLine(cm, cm.doc.sel.to.line, "smart");}), 75);

    if (handleCharBinding(cm, e, ch)) return;

    if (ie && !ie_lt9) cm.display.inputHasSelection = null;

    fastPoll(cm);

  }



  function onFocus(cm) {

    if (cm.options.readOnly == "nocursor") return;

    if (!cm.state.focused) {

      signal(cm, "focus", cm);

      cm.state.focused = true;

      if (cm.display.wrapper.className.search(/\bCodeMirror-focused\b/) == -1)

        cm.display.wrapper.className += " CodeMirror-focused";

      if (!cm.curOp) {

        resetInput(cm, true);

        if (webkit) setTimeout(bind(resetInput, cm, true), 0); // Issue #1730

      }

    }

    slowPoll(cm);

    restartBlink(cm);

  }

  function onBlur(cm) {

    if (cm.state.focused) {

      signal(cm, "blur", cm);

      cm.state.focused = false;

      cm.display.wrapper.className = cm.display.wrapper.className.replace(" CodeMirror-focused", "");

    }

    clearInterval(cm.display.blinker);

    setTimeout(function() {if (!cm.state.focused) cm.doc.sel.shift = false;}, 150);

  }



  var detectingSelectAll;

  function onContextMenu(cm, e) {

    if (signalDOMEvent(cm, e, "contextmenu")) return;

    var display = cm.display, sel = cm.doc.sel;

    if (eventInWidget(display, e)) return;



    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;

    if (!pos || opera) return; // Opera is difficult.

    if (posEq(sel.from, sel.to) || posLess(pos, sel.from) || !posLess(pos, sel.to))

      operation(cm, setSelection)(cm.doc, pos, pos);



    var oldCSS = display.input.style.cssText;

    display.inputDiv.style.position = "absolute";

    display.input.style.cssText = "position: fixed; width: 30px; height: 30px; top: " + (e.clientY - 5) +

      "px; left: " + (e.clientX - 5) + "px; z-index: 1000; background: white; outline: none;" +

      "border-width: 0; outline: none; overflow: hidden; opacity: .05; -ms-opacity: .05; filter: alpha(opacity=5);";

    focusInput(cm);

    resetInput(cm, true);

    // Adds "Select all" to context menu in FF

    if (posEq(sel.from, sel.to)) display.input.value = display.prevInput = " ";



    function prepareSelectAllHack() {

      if (display.input.selectionStart != null) {

        var extval = display.input.value = " " + (posEq(sel.from, sel.to) ? "" : display.input.value);

        display.prevInput = " ";

        display.input.selectionStart = 1; display.input.selectionEnd = extval.length;

      }

    }

    function rehide() {

      display.inputDiv.style.position = "relative";

      display.input.style.cssText = oldCSS;

      if (ie_lt9) display.scrollbarV.scrollTop = display.scroller.scrollTop = scrollPos;

      slowPoll(cm);



      // Try to detect the user choosing select-all

      if (display.input.selectionStart != null) {

        if (!ie || ie_lt9) prepareSelectAllHack();

        clearTimeout(detectingSelectAll);

        var i = 0, poll = function(){

          if (display.prevInput == " " && display.input.selectionStart == 0)

            operation(cm, commands.selectAll)(cm);

          else if (i++ < 10) detectingSelectAll = setTimeout(poll, 500);

          else resetInput(cm);

        };

        detectingSelectAll = setTimeout(poll, 200);

      }

    }



    if (ie && !ie_lt9) prepareSelectAllHack();

    if (captureMiddleClick) {

      e_stop(e);

      var mouseup = function() {

        off(window, "mouseup", mouseup);

        setTimeout(rehide, 20);

      };

      on(window, "mouseup", mouseup);

    } else {

      setTimeout(rehide, 50);

    }

  }



  // UPDATING



  var changeEnd = CodeMirror.changeEnd = function(change) {

    if (!change.text) return change.to;

    return Pos(change.from.line + change.text.length - 1,

               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0));

  };



  // Make sure a position will be valid after the given change.

  function clipPostChange(doc, change, pos) {

    if (!posLess(change.from, pos)) return clipPos(doc, pos);

    var diff = (change.text.length - 1) - (change.to.line - change.from.line);

    if (pos.line > change.to.line + diff) {

      var preLine = pos.line - diff, lastLine = doc.first + doc.size - 1;

      if (preLine > lastLine) return Pos(lastLine, getLine(doc, lastLine).text.length);

      return clipToLen(pos, getLine(doc, preLine).text.length);

    }

    if (pos.line == change.to.line + diff)

      return clipToLen(pos, lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0) +

                       getLine(doc, change.to.line).text.length - change.to.ch);

    var inside = pos.line - change.from.line;

    return clipToLen(pos, change.text[inside].length + (inside ? 0 : change.from.ch));

  }



  // Hint can be null|"end"|"start"|"around"|{anchor,head}

  function computeSelAfterChange(doc, change, hint) {

    if (hint && typeof hint == "object") // Assumed to be {anchor, head} object

      return {anchor: clipPostChange(doc, change, hint.anchor),

              head: clipPostChange(doc, change, hint.head)};



    if (hint == "start") return {anchor: change.from, head: change.from};



    var end = changeEnd(change);

    if (hint == "around") return {anchor: change.from, head: end};

    if (hint == "end") return {anchor: end, head: end};



    // hint is null, leave the selection alone as much as possible

    var adjustPos = function(pos) {

      if (posLess(pos, change.from)) return pos;

      if (!posLess(change.to, pos)) return end;



      var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;

      if (pos.line == change.to.line) ch += end.ch - change.to.ch;

      return Pos(line, ch);

    };

    return {anchor: adjustPos(doc.sel.anchor), head: adjustPos(doc.sel.head)};

  }



  function filterChange(doc, change, update) {

    var obj = {

      canceled: false,

      from: change.from,

      to: change.to,

      text: change.text,

      origin: change.origin,

      cancel: function() { this.canceled = true; }

    };

    if (update) obj.update = function(from, to, text, origin) {

      if (from) this.from = clipPos(doc, from);

      if (to) this.to = clipPos(doc, to);

      if (text) this.text = text;

      if (origin !== undefined) this.origin = origin;

    };

    signal(doc, "beforeChange", doc, obj);

    if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj);



    if (obj.canceled) return null;

    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin};

  }



  // Replace the range from from to to by the strings in replacement.

  // change is a {from, to, text [, origin]} object

  function makeChange(doc, change, selUpdate, ignoreReadOnly) {

    if (doc.cm) {

      if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, selUpdate, ignoreReadOnly);

      if (doc.cm.state.suppressEdits) return;

    }



    if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {

      change = filterChange(doc, change, true);

      if (!change) return;

    }



    // Possibly split or suppress the update based on the presence

    // of read-only spans in its range.

    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);

    if (split) {

      for (var i = split.length - 1; i >= 1; --i)

        makeChangeNoReadonly(doc, {from: split[i].from, to: split[i].to, text: [""]});

      if (split.length)

        makeChangeNoReadonly(doc, {from: split[0].from, to: split[0].to, text: change.text}, selUpdate);

    } else {

      makeChangeNoReadonly(doc, change, selUpdate);

    }

  }



  function makeChangeNoReadonly(doc, change, selUpdate) {

    var selAfter = computeSelAfterChange(doc, change, selUpdate);

    addToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);



    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));

    var rebased = [];



    linkedDocs(doc, function(doc, sharedHist) {

      if (!sharedHist && indexOf(rebased, doc.history) == -1) {

        rebaseHist(doc.history, change);

        rebased.push(doc.history);

      }

      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));

    });

  }



  function makeChangeFromHistory(doc, type) {

    if (doc.cm && doc.cm.state.suppressEdits) return;



    var hist = doc.history;

    var event = (type == "undo" ? hist.done : hist.undone).pop();

    if (!event) return;



    var anti = {changes: [], anchorBefore: event.anchorAfter, headBefore: event.headAfter,

                anchorAfter: event.anchorBefore, headAfter: event.headBefore,

                generation: hist.generation};

    (type == "undo" ? hist.undone : hist.done).push(anti);

    hist.generation = event.generation || ++hist.maxGeneration;



    var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");



    for (var i = event.changes.length - 1; i >= 0; --i) {

      var change = event.changes[i];

      change.origin = type;

      if (filter && !filterChange(doc, change, false)) {

        (type == "undo" ? hist.done : hist.undone).length = 0;

        return;

      }



      anti.changes.push(historyChangeFromChange(doc, change));



      var after = i ? computeSelAfterChange(doc, change, null)

                    : {anchor: event.anchorBefore, head: event.headBefore};

      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));

      var rebased = [];



      linkedDocs(doc, function(doc, sharedHist) {

        if (!sharedHist && indexOf(rebased, doc.history) == -1) {

          rebaseHist(doc.history, change);

          rebased.push(doc.history);

        }

        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));

      });

    }

  }



  function shiftDoc(doc, distance) {

    function shiftPos(pos) {return Pos(pos.line + distance, pos.ch);}

    doc.first += distance;

    if (doc.cm) regChange(doc.cm, doc.first, doc.first, distance);

    doc.sel.head = shiftPos(doc.sel.head); doc.sel.anchor = shiftPos(doc.sel.anchor);

    doc.sel.from = shiftPos(doc.sel.from); doc.sel.to = shiftPos(doc.sel.to);

  }



  function makeChangeSingleDoc(doc, change, selAfter, spans) {

    if (doc.cm && !doc.cm.curOp)

      return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans);



    if (change.to.line < doc.first) {

      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));

      return;

    }

    if (change.from.line > doc.lastLine()) return;



    // Clip the change to the size of this doc

    if (change.from.line < doc.first) {

      var shift = change.text.length - 1 - (doc.first - change.from.line);

      shiftDoc(doc, shift);

      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),

                text: [lst(change.text)], origin: change.origin};

    }

    var last = doc.lastLine();

    if (change.to.line > last) {

      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),

                text: [change.text[0]], origin: change.origin};

    }



    change.removed = getBetween(doc, change.from, change.to);



    if (!selAfter) selAfter = computeSelAfterChange(doc, change, null);

    if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans, selAfter);

    else updateDoc(doc, change, spans, selAfter);

  }



  function makeChangeSingleDocInEditor(cm, change, spans, selAfter) {

    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;



    var recomputeMaxLength = false, checkWidthStart = from.line;

    if (!cm.options.lineWrapping) {

      checkWidthStart = lineNo(visualLine(doc, getLine(doc, from.line)));

      doc.iter(checkWidthStart, to.line + 1, function(line) {

        if (line == display.maxLine) {

          recomputeMaxLength = true;

          return true;

        }

      });

    }



    if (!posLess(doc.sel.head, change.from) && !posLess(change.to, doc.sel.head))

      cm.curOp.cursorActivity = true;



    updateDoc(doc, change, spans, selAfter, estimateHeight(cm));



    if (!cm.options.lineWrapping) {

      doc.iter(checkWidthStart, from.line + change.text.length, function(line) {

        var len = lineLength(doc, line);

        if (len > display.maxLineLength) {

          display.maxLine = line;

          display.maxLineLength = len;

          display.maxLineChanged = true;

          recomputeMaxLength = false;

        }

      });

      if (recomputeMaxLength) cm.curOp.updateMaxLine = true;

    }



    // Adjust frontier, schedule worker

    doc.frontier = Math.min(doc.frontier, from.line);

    startWorker(cm, 400);



    var lendiff = change.text.length - (to.line - from.line) - 1;

    // Remember that these lines changed, for updating the display

    regChange(cm, from.line, to.line + 1, lendiff);



    if (hasHandler(cm, "change")) {

      var changeObj = {from: from, to: to,

                       text: change.text,

                       removed: change.removed,

                       origin: change.origin};

      if (cm.curOp.textChanged) {

        for (var cur = cm.curOp.textChanged; cur.next; cur = cur.next) {}

        cur.next = changeObj;

      } else cm.curOp.textChanged = changeObj;

    }

  }



  function replaceRange(doc, code, from, to, origin) {

    if (!to) to = from;

    if (posLess(to, from)) { var tmp = to; to = from; from = tmp; }

    if (typeof code == "string") code = splitLines(code);

    makeChange(doc, {from: from, to: to, text: code, origin: origin}, null);

  }



  // POSITION OBJECT



  function Pos(line, ch) {

    if (!(this instanceof Pos)) return new Pos(line, ch);

    this.line = line; this.ch = ch;

  }

  CodeMirror.Pos = Pos;



  function posEq(a, b) {return a.line == b.line && a.ch == b.ch;}

  function posLess(a, b) {return a.line < b.line || (a.line == b.line && a.ch < b.ch);}

  function copyPos(x) {return Pos(x.line, x.ch);}



  // SELECTION



  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1));}

  function clipPos(doc, pos) {

    if (pos.line < doc.first) return Pos(doc.first, 0);

    var last = doc.first + doc.size - 1;

    if (pos.line > last) return Pos(last, getLine(doc, last).text.length);

    return clipToLen(pos, getLine(doc, pos.line).text.length);

  }

  function clipToLen(pos, linelen) {

    var ch = pos.ch;

    if (ch == null || ch > linelen) return Pos(pos.line, linelen);

    else if (ch < 0) return Pos(pos.line, 0);

    else return pos;

  }

  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size;}



  // If shift is held, this will move the selection anchor. Otherwise,

  // it'll set the whole selection.

  function extendSelection(doc, pos, other, bias) {

    if (doc.sel.shift || doc.sel.extend) {

      var anchor = doc.sel.anchor;

      if (other) {

        var posBefore = posLess(pos, anchor);

        if (posBefore != posLess(other, anchor)) {

          anchor = pos;

          pos = other;

        } else if (posBefore != posLess(pos, other)) {

          pos = other;

        }

      }

      setSelection(doc, anchor, pos, bias);

    } else {

      setSelection(doc, pos, other || pos, bias);

    }

    if (doc.cm) doc.cm.curOp.userSelChange = true;

  }



  function filterSelectionChange(doc, anchor, head) {

    var obj = {anchor: anchor, head: head};

    signal(doc, "beforeSelectionChange", doc, obj);

    if (doc.cm) signal(doc.cm, "beforeSelectionChange", doc.cm, obj);

    obj.anchor = clipPos(doc, obj.anchor); obj.head = clipPos(doc, obj.head);

    return obj;

  }



  // Update the selection. Last two args are only used by

  // updateDoc, since they have to be expressed in the line

  // numbers before the update.

  function setSelection(doc, anchor, head, bias, checkAtomic) {

    if (!checkAtomic && hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange")) {

      var filtered = filterSelectionChange(doc, anchor, head);

      head = filtered.head;

      anchor = filtered.anchor;

    }



    var sel = doc.sel;

    sel.goalColumn = null;

    // Skip over atomic spans.

    if (checkAtomic || !posEq(anchor, sel.anchor))

      anchor = skipAtomic(doc, anchor, bias, checkAtomic != "push");

    if (checkAtomic || !posEq(head, sel.head))

      head = skipAtomic(doc, head, bias, checkAtomic != "push");



    if (posEq(sel.anchor, anchor) && posEq(sel.head, head)) return;



    sel.anchor = anchor; sel.head = head;

    var inv = posLess(head, anchor);

    sel.from = inv ? head : anchor;

    sel.to = inv ? anchor : head;



    if (doc.cm)

      doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged =

        doc.cm.curOp.cursorActivity = true;



    signalLater(doc, "cursorActivity", doc);

  }



  function reCheckSelection(cm) {

    setSelection(cm.doc, cm.doc.sel.from, cm.doc.sel.to, null, "push");

  }



  function skipAtomic(doc, pos, bias, mayClear) {

    var flipped = false, curPos = pos;

    var dir = bias || 1;

    doc.cantEdit = false;

    search: for (;;) {

      var line = getLine(doc, curPos.line);

      if (line.markedSpans) {

        for (var i = 0; i < line.markedSpans.length; ++i) {

          var sp = line.markedSpans[i], m = sp.marker;

          if ((sp.from == null || (m.inclusiveLeft ? sp.from <= curPos.ch : sp.from < curPos.ch)) &&

              (sp.to == null || (m.inclusiveRight ? sp.to >= curPos.ch : sp.to > curPos.ch))) {

            if (mayClear) {

              signal(m, "beforeCursorEnter");

              if (m.explicitlyCleared) {

                if (!line.markedSpans) break;

                else {--i; continue;}

              }

            }

            if (!m.atomic) continue;

            var newPos = m.find()[dir < 0 ? "from" : "to"];

            if (posEq(newPos, curPos)) {

              newPos.ch += dir;

              if (newPos.ch < 0) {

                if (newPos.line > doc.first) newPos = clipPos(doc, Pos(newPos.line - 1));

                else newPos = null;

              } else if (newPos.ch > line.text.length) {

                if (newPos.line < doc.first + doc.size - 1) newPos = Pos(newPos.line + 1, 0);

                else newPos = null;

              }

              if (!newPos) {

                if (flipped) {

                  // Driven in a corner -- no valid cursor position found at all

                  // -- try again *with* clearing, if we didn't already

                  if (!mayClear) return skipAtomic(doc, pos, bias, true);

                  // Otherwise, turn off editing until further notice, and return the start of the doc

                  doc.cantEdit = true;

                  return Pos(doc.first, 0);

                }

                flipped = true; newPos = pos; dir = -dir;

              }

            }

            curPos = newPos;

            continue search;

          }

        }

      }

      return curPos;

    }

  }



  // SCROLLING



  function scrollCursorIntoView(cm) {

    var coords = scrollPosIntoView(cm, cm.doc.sel.head, cm.options.cursorScrollMargin);

    if (!cm.state.focused) return;

    var display = cm.display, box = getRect(display.sizer), doScroll = null;

    if (coords.top + box.top < 0) doScroll = true;

    else if (coords.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) doScroll = false;

    if (doScroll != null && !phantom) {

      var hidden = display.cursor.style.display == "none";

      if (hidden) {

        display.cursor.style.display = "";

        display.cursor.style.left = coords.left + "px";

        display.cursor.style.top = (coords.top - display.viewOffset) + "px";

      }

      display.cursor.scrollIntoView(doScroll);

      if (hidden) display.cursor.style.display = "none";

    }

  }



  function scrollPosIntoView(cm, pos, margin) {

    if (margin == null) margin = 0;

    for (;;) {

      var changed = false, coords = cursorCoords(cm, pos);

      var scrollPos = calculateScrollPos(cm, coords.left, coords.top - margin, coords.left, coords.bottom + margin);

      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;

      if (scrollPos.scrollTop != null) {

        setScrollTop(cm, scrollPos.scrollTop);

        if (Math.abs(cm.doc.scrollTop - startTop) > 1) changed = true;

      }

      if (scrollPos.scrollLeft != null) {

        setScrollLeft(cm, scrollPos.scrollLeft);

        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) changed = true;

      }

      if (!changed) return coords;

    }

  }



  function scrollIntoView(cm, x1, y1, x2, y2) {

    var scrollPos = calculateScrollPos(cm, x1, y1, x2, y2);

    if (scrollPos.scrollTop != null) setScrollTop(cm, scrollPos.scrollTop);

    if (scrollPos.scrollLeft != null) setScrollLeft(cm, scrollPos.scrollLeft);

  }



  function calculateScrollPos(cm, x1, y1, x2, y2) {

    var display = cm.display, snapMargin = textHeight(cm.display);

    if (y1 < 0) y1 = 0;

    var screen = display.scroller.clientHeight - scrollerCutOff, screentop = display.scroller.scrollTop, result = {};

    var docBottom = cm.doc.height + paddingVert(display);

    var atTop = y1 < snapMargin, atBottom = y2 > docBottom - snapMargin;

    if (y1 < screentop) {

      result.scrollTop = atTop ? 0 : y1;

    } else if (y2 > screentop + screen) {

      var newTop = Math.min(y1, (atBottom ? docBottom : y2) - screen);

      if (newTop != screentop) result.scrollTop = newTop;

    }



    var screenw = display.scroller.clientWidth - scrollerCutOff, screenleft = display.scroller.scrollLeft;

    x1 += display.gutters.offsetWidth; x2 += display.gutters.offsetWidth;

    var gutterw = display.gutters.offsetWidth;

    var atLeft = x1 < gutterw + 10;

    if (x1 < screenleft + gutterw || atLeft) {

      if (atLeft) x1 = 0;

      result.scrollLeft = Math.max(0, x1 - 10 - gutterw);

    } else if (x2 > screenw + screenleft - 3) {

      result.scrollLeft = x2 + 10 - screenw;

    }

    return result;

  }



  function updateScrollPos(cm, left, top) {

    cm.curOp.updateScrollPos = {scrollLeft: left == null ? cm.doc.scrollLeft : left,

                                scrollTop: top == null ? cm.doc.scrollTop : top};

  }



  function addToScrollPos(cm, left, top) {

    var pos = cm.curOp.updateScrollPos || (cm.curOp.updateScrollPos = {scrollLeft: cm.doc.scrollLeft, scrollTop: cm.doc.scrollTop});

    var scroll = cm.display.scroller;

    pos.scrollTop = Math.max(0, Math.min(scroll.scrollHeight - scroll.clientHeight, pos.scrollTop + top));

    pos.scrollLeft = Math.max(0, Math.min(scroll.scrollWidth - scroll.clientWidth, pos.scrollLeft + left));

  }



  // API UTILITIES



  function indentLine(cm, n, how, aggressive) {

    var doc = cm.doc;

    if (how == null) how = "add";

    if (how == "smart") {

      if (!cm.doc.mode.indent) how = "prev";

      else var state = getStateBefore(cm, n);

    }



    var tabSize = cm.options.tabSize;

    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);

    var curSpaceString = line.text.match(/^\s*/)[0], indentation;

    if (how == "smart") {

      indentation = cm.doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);

      if (indentation == Pass) {

        if (!aggressive) return;

        how = "prev";

      }

    }

    if (how == "prev") {

      if (n > doc.first) indentation = countColumn(getLine(doc, n-1).text, null, tabSize);

      else indentation = 0;

    } else if (how == "add") {

      indentation = curSpace + cm.options.indentUnit;

    } else if (how == "subtract") {

      indentation = curSpace - cm.options.indentUnit;

    } else if (typeof how == "number") {

      indentation = curSpace + how;

    }

    indentation = Math.max(0, indentation);



    var indentString = "", pos = 0;

    if (cm.options.indentWithTabs)

      for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";}

    if (pos < indentation) indentString += spaceStr(indentation - pos);



    if (indentString != curSpaceString)

      replaceRange(cm.doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");

    line.stateAfter = null;

  }



  function changeLine(cm, handle, op) {

    var no = handle, line = handle, doc = cm.doc;

    if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle));

    else no = lineNo(handle);

    if (no == null) return null;

    if (op(line, no)) regChange(cm, no, no + 1);

    else return null;

    return line;

  }



  function findPosH(doc, pos, dir, unit, visually) {

    var line = pos.line, ch = pos.ch, origDir = dir;

    var lineObj = getLine(doc, line);

    var possible = true;

    function findNextLine() {

      var l = line + dir;

      if (l < doc.first || l >= doc.first + doc.size) return (possible = false);

      line = l;

      return lineObj = getLine(doc, l);

    }

    function moveOnce(boundToLine) {

      var next = (visually ? moveVisually : moveLogically)(lineObj, ch, dir, true);

      if (next == null) {

        if (!boundToLine && findNextLine()) {

          if (visually) ch = (dir < 0 ? lineRight : lineLeft)(lineObj);

          else ch = dir < 0 ? lineObj.text.length : 0;

        } else return (possible = false);

      } else ch = next;

      return true;

    }



    if (unit == "char") moveOnce();

    else if (unit == "column") moveOnce(true);

    else if (unit == "word" || unit == "group") {

      var sawType = null, group = unit == "group";

      for (var first = true;; first = false) {

        if (dir < 0 && !moveOnce(!first)) break;

        var cur = lineObj.text.charAt(ch) || "\n";

        var type = isWordChar(cur) ? "w"

          : !group ? null

          : /\s/.test(cur) ? null

          : "p";

        if (sawType && sawType != type) {

          if (dir < 0) {dir = 1; moveOnce();}

          break;

        }

        if (type) sawType = type;

        if (dir > 0 && !moveOnce(!first)) break;

      }

    }

    var result = skipAtomic(doc, Pos(line, ch), origDir, true);

    if (!possible) result.hitSide = true;

    return result;

  }



  function findPosV(cm, pos, dir, unit) {

    var doc = cm.doc, x = pos.left, y;

    if (unit == "page") {

      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);

      y = pos.top + dir * (pageSize - (dir < 0 ? 1.5 : .5) * textHeight(cm.display));

    } else if (unit == "line") {

      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;

    }

    for (;;) {

      var target = coordsChar(cm, x, y);

      if (!target.outside) break;

      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break; }

      y += dir * 5;

    }

    return target;

  }



  function findWordAt(line, pos) {

    var start = pos.ch, end = pos.ch;

    if (line) {

      if ((pos.xRel < 0 || end == line.length) && start) --start; else ++end;

      var startChar = line.charAt(start);

      var check = isWordChar(startChar) ? isWordChar

        : /\s/.test(startChar) ? function(ch) {return /\s/.test(ch);}

        : function(ch) {return !/\s/.test(ch) && !isWordChar(ch);};

      while (start > 0 && check(line.charAt(start - 1))) --start;

      while (end < line.length && check(line.charAt(end))) ++end;

    }

    return {from: Pos(pos.line, start), to: Pos(pos.line, end)};

  }



  function selectLine(cm, line) {

    extendSelection(cm.doc, Pos(line, 0), clipPos(cm.doc, Pos(line + 1, 0)));

  }



  // PROTOTYPE



  // The publicly visible API. Note that operation(null, f) means

  // 'wrap f in an operation, performed on its `this` parameter'



  CodeMirror.prototype = {

    constructor: CodeMirror,

    focus: function(){window.focus(); focusInput(this); onFocus(this); fastPoll(this);},



    setOption: function(option, value) {

      var options = this.options, old = options[option];

      if (options[option] == value && option != "mode") return;

      options[option] = value;

      if (optionHandlers.hasOwnProperty(option))

        operation(this, optionHandlers[option])(this, value, old);

    },



    getOption: function(option) {return this.options[option];},

    getDoc: function() {return this.doc;},



    addKeyMap: function(map, bottom) {

      this.state.keyMaps[bottom ? "push" : "unshift"](map);

    },

    removeKeyMap: function(map) {

      var maps = this.state.keyMaps;

      for (var i = 0; i < maps.length; ++i)

        if (maps[i] == map || (typeof maps[i] != "string" && maps[i].name == map)) {

          maps.splice(i, 1);

          return true;

        }

    },



    addOverlay: operation(null, function(spec, options) {

      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);

      if (mode.startState) throw new Error("Overlays may not be stateful.");

      this.state.overlays.push({mode: mode, modeSpec: spec, opaque: options && options.opaque});

      this.state.modeGen++;

      regChange(this);

    }),

    removeOverlay: operation(null, function(spec) {

      var overlays = this.state.overlays;

      for (var i = 0; i < overlays.length; ++i) {

        var cur = overlays[i].modeSpec;

        if (cur == spec || typeof spec == "string" && cur.name == spec) {

          overlays.splice(i, 1);

          this.state.modeGen++;

          regChange(this);

          return;

        }

      }

    }),



    indentLine: operation(null, function(n, dir, aggressive) {

      if (typeof dir != "string" && typeof dir != "number") {

        if (dir == null) dir = this.options.smartIndent ? "smart" : "prev";

        else dir = dir ? "add" : "subtract";

      }

      if (isLine(this.doc, n)) indentLine(this, n, dir, aggressive);

    }),

    indentSelection: operation(null, function(how) {

      var sel = this.doc.sel;

      if (posEq(sel.from, sel.to)) return indentLine(this, sel.from.line, how);

      var e = sel.to.line - (sel.to.ch ? 0 : 1);

      for (var i = sel.from.line; i <= e; ++i) indentLine(this, i, how);

    }),



    // Fetch the parser token for a given character. Useful for hacks

    // that want to inspect the mode state (say, for completion).

    getTokenAt: function(pos, precise) {

      var doc = this.doc;

      pos = clipPos(doc, pos);

      var state = getStateBefore(this, pos.line, precise), mode = this.doc.mode;

      var line = getLine(doc, pos.line);

      var stream = new StringStream(line.text, this.options.tabSize);

      while (stream.pos < pos.ch && !stream.eol()) {

        stream.start = stream.pos;

        var style = mode.token(stream, state);

      }

      return {start: stream.start,

              end: stream.pos,

              string: stream.current(),

              className: style || null, // Deprecated, use 'type' instead

              type: style || null,

              state: state};

    },



    getTokenTypeAt: function(pos) {

      pos = clipPos(this.doc, pos);

      var styles = getLineStyles(this, getLine(this.doc, pos.line));

      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;

      if (ch == 0) return styles[2];

      for (;;) {

        var mid = (before + after) >> 1;

        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) after = mid;

        else if (styles[mid * 2 + 1] < ch) before = mid + 1;

        else return styles[mid * 2 + 2];

      }

    },



    getModeAt: function(pos) {

      var mode = this.doc.mode;

      if (!mode.innerMode) return mode;

      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode;

    },



    getHelper: function(pos, type) {

      if (!helpers.hasOwnProperty(type)) return;

      var help = helpers[type], mode = this.getModeAt(pos);

      return mode[type] && help[mode[type]] ||

        mode.helperType && help[mode.helperType] ||

        help[mode.name];

    },



    getStateAfter: function(line, precise) {

      var doc = this.doc;

      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);

      return getStateBefore(this, line + 1, precise);

    },



    cursorCoords: function(start, mode) {

      var pos, sel = this.doc.sel;

      if (start == null) pos = sel.head;

      else if (typeof start == "object") pos = clipPos(this.doc, start);

      else pos = start ? sel.from : sel.to;

      return cursorCoords(this, pos, mode || "page");

    },



    charCoords: function(pos, mode) {

      return charCoords(this, clipPos(this.doc, pos), mode || "page");

    },



    coordsChar: function(coords, mode) {

      coords = fromCoordSystem(this, coords, mode || "page");

      return coordsChar(this, coords.left, coords.top);

    },



    lineAtHeight: function(height, mode) {

      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;

      return lineAtHeight(this.doc, height + this.display.viewOffset);

    },

    heightAtLine: function(line, mode) {

      var end = false, last = this.doc.first + this.doc.size - 1;

      if (line < this.doc.first) line = this.doc.first;

      else if (line > last) { line = last; end = true; }

      var lineObj = getLine(this.doc, line);

      return intoCoordSystem(this, getLine(this.doc, line), {top: 0, left: 0}, mode || "page").top +

        (end ? lineObj.height : 0);

    },



    defaultTextHeight: function() { return textHeight(this.display); },

    defaultCharWidth: function() { return charWidth(this.display); },



    setGutterMarker: operation(null, function(line, gutterID, value) {

      return changeLine(this, line, function(line) {

        var markers = line.gutterMarkers || (line.gutterMarkers = {});

        markers[gutterID] = value;

        if (!value && isEmpty(markers)) line.gutterMarkers = null;

        return true;

      });

    }),



    clearGutter: operation(null, function(gutterID) {

      var cm = this, doc = cm.doc, i = doc.first;

      doc.iter(function(line) {

        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {

          line.gutterMarkers[gutterID] = null;

          regChange(cm, i, i + 1);

          if (isEmpty(line.gutterMarkers)) line.gutterMarkers = null;

        }

        ++i;

      });

    }),



    addLineClass: operation(null, function(handle, where, cls) {

      return changeLine(this, handle, function(line) {

        var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";

        if (!line[prop]) line[prop] = cls;

        else if (new RegExp("(?:^|\\s)" + cls + "(?:$|\\s)").test(line[prop])) return false;

        else line[prop] += " " + cls;

        return true;

      });

    }),



    removeLineClass: operation(null, function(handle, where, cls) {

      return changeLine(this, handle, function(line) {

        var prop = where == "text" ? "textClass" : where == "background" ? "bgClass" : "wrapClass";

        var cur = line[prop];

        if (!cur) return false;

        else if (cls == null) line[prop] = null;

        else {

          var found = cur.match(new RegExp("(?:^|\\s+)" + cls + "(?:$|\\s+)"));

          if (!found) return false;

          var end = found.index + found[0].length;

          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;

        }

        return true;

      });

    }),



    addLineWidget: operation(null, function(handle, node, options) {

      return addLineWidget(this, handle, node, options);

    }),



    removeLineWidget: function(widget) { widget.clear(); },



    lineInfo: function(line) {

      if (typeof line == "number") {

        if (!isLine(this.doc, line)) return null;

        var n = line;

        line = getLine(this.doc, line);

        if (!line) return null;

      } else {

        var n = lineNo(line);

        if (n == null) return null;

      }

      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,

              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,

              widgets: line.widgets};

    },



    getViewport: function() { return {from: this.display.showingFrom, to: this.display.showingTo};},



    addWidget: function(pos, node, scroll, vert, horiz) {

      var display = this.display;

      pos = cursorCoords(this, clipPos(this.doc, pos));

      var top = pos.bottom, left = pos.left;

      node.style.position = "absolute";

      display.sizer.appendChild(node);

      if (vert == "over") {

        top = pos.top;

      } else if (vert == "above" || vert == "near") {

        var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),

        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);

        // Default to positioning above (if specified and possible); otherwise default to positioning below

        if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)

          top = pos.top - node.offsetHeight;

        else if (pos.bottom + node.offsetHeight <= vspace)

          top = pos.bottom;

        if (left + node.offsetWidth > hspace)

          left = hspace - node.offsetWidth;

      }

      node.style.top = top + "px";

      node.style.left = node.style.right = "";

      if (horiz == "right") {

        left = display.sizer.clientWidth - node.offsetWidth;

        node.style.right = "0px";

      } else {

        if (horiz == "left") left = 0;

        else if (horiz == "middle") left = (display.sizer.clientWidth - node.offsetWidth) / 2;

        node.style.left = left + "px";

      }

      if (scroll)

        scrollIntoView(this, left, top, left + node.offsetWidth, top + node.offsetHeight);

    },



    triggerOnKeyDown: operation(null, onKeyDown),



    execCommand: function(cmd) {return commands[cmd](this);},



    findPosH: function(from, amount, unit, visually) {

      var dir = 1;

      if (amount < 0) { dir = -1; amount = -amount; }

      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {

        cur = findPosH(this.doc, cur, dir, unit, visually);

        if (cur.hitSide) break;

      }

      return cur;

    },



    moveH: operation(null, function(dir, unit) {

      var sel = this.doc.sel, pos;

      if (sel.shift || sel.extend || posEq(sel.from, sel.to))

        pos = findPosH(this.doc, sel.head, dir, unit, this.options.rtlMoveVisually);

      else

        pos = dir < 0 ? sel.from : sel.to;

      extendSelection(this.doc, pos, pos, dir);

    }),



    deleteH: operation(null, function(dir, unit) {

      var sel = this.doc.sel;

      if (!posEq(sel.from, sel.to)) replaceRange(this.doc, "", sel.from, sel.to, "+delete");

      else replaceRange(this.doc, "", sel.from, findPosH(this.doc, sel.head, dir, unit, false), "+delete");

      this.curOp.userSelChange = true;

    }),



    findPosV: function(from, amount, unit, goalColumn) {

      var dir = 1, x = goalColumn;

      if (amount < 0) { dir = -1; amount = -amount; }

      for (var i = 0, cur = clipPos(this.doc, from); i < amount; ++i) {

        var coords = cursorCoords(this, cur, "div");

        if (x == null) x = coords.left;

        else coords.left = x;

        cur = findPosV(this, coords, dir, unit);

        if (cur.hitSide) break;

      }

      return cur;

    },



    moveV: operation(null, function(dir, unit) {

      var sel = this.doc.sel;

      var pos = cursorCoords(this, sel.head, "div");

      if (sel.goalColumn != null) pos.left = sel.goalColumn;

      var target = findPosV(this, pos, dir, unit);



      if (unit == "page") addToScrollPos(this, 0, charCoords(this, target, "div").top - pos.top);

      extendSelection(this.doc, target, target, dir);

      sel.goalColumn = pos.left;

    }),



    toggleOverwrite: function(value) {

      if (value != null && value == this.state.overwrite) return;

      if (this.state.overwrite = !this.state.overwrite)

        this.display.cursor.className += " CodeMirror-overwrite";

      else

        this.display.cursor.className = this.display.cursor.className.replace(" CodeMirror-overwrite", "");

    },

    hasFocus: function() { return this.state.focused; },



    scrollTo: operation(null, function(x, y) {

      updateScrollPos(this, x, y);

    }),

    getScrollInfo: function() {

      var scroller = this.display.scroller, co = scrollerCutOff;

      return {left: scroller.scrollLeft, top: scroller.scrollTop,

              height: scroller.scrollHeight - co, width: scroller.scrollWidth - co,

              clientHeight: scroller.clientHeight - co, clientWidth: scroller.clientWidth - co};

    },



    scrollIntoView: operation(null, function(pos, margin) {

      if (typeof pos == "number") pos = Pos(pos, 0);

      if (!margin) margin = 0;

      var coords = pos;



      if (!pos || pos.line != null) {

        this.curOp.scrollToPos = pos ? clipPos(this.doc, pos) : this.doc.sel.head;

        this.curOp.scrollToPosMargin = margin;

        coords = cursorCoords(this, this.curOp.scrollToPos);

      }

      var sPos = calculateScrollPos(this, coords.left, coords.top - margin, coords.right, coords.bottom + margin);

      updateScrollPos(this, sPos.scrollLeft, sPos.scrollTop);

    }),



    setSize: operation(null, function(width, height) {

      function interpret(val) {

        return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val;

      }

      if (width != null) this.display.wrapper.style.width = interpret(width);

      if (height != null) this.display.wrapper.style.height = interpret(height);

      if (this.options.lineWrapping)

        this.display.measureLineCache.length = this.display.measureLineCachePos = 0;

      this.curOp.forceUpdate = true;

    }),



    operation: function(f){return runInOp(this, f);},



    refresh: operation(null, function() {

      clearCaches(this);

      updateScrollPos(this, this.doc.scrollLeft, this.doc.scrollTop);

      regChange(this);

    }),



    swapDoc: operation(null, function(doc) {

      var old = this.doc;

      old.cm = null;

      attachDoc(this, doc);

      clearCaches(this);

      resetInput(this, true);

      updateScrollPos(this, doc.scrollLeft, doc.scrollTop);

      return old;

    }),



    getInputField: function(){return this.display.input;},

    getWrapperElement: function(){return this.display.wrapper;},

    getScrollerElement: function(){return this.display.scroller;},

    getGutterElement: function(){return this.display.gutters;}

  };

  eventMixin(CodeMirror);



  // OPTION DEFAULTS



  var optionHandlers = CodeMirror.optionHandlers = {};



  // The default configuration options.

  var defaults = CodeMirror.defaults = {};



  function option(name, deflt, handle, notOnInit) {

    CodeMirror.defaults[name] = deflt;

    if (handle) optionHandlers[name] =

      notOnInit ? function(cm, val, old) {if (old != Init) handle(cm, val, old);} : handle;

  }



  var Init = CodeMirror.Init = {toString: function(){return "CodeMirror.Init";}};



  // These two are, on init, called from the constructor because they

  // have to be initialized before the editor can start at all.

  option("value", "", function(cm, val) {

    cm.setValue(val);

  }, true);

  option("mode", null, function(cm, val) {

    cm.doc.modeOption = val;

    loadMode(cm);

  }, true);



  option("indentUnit", 2, loadMode, true);

  option("indentWithTabs", false);

  option("smartIndent", true);

  option("tabSize", 4, function(cm) {

    loadMode(cm);

    clearCaches(cm);

    regChange(cm);

  }, true);

  option("electricChars", true);

  option("rtlMoveVisually", !windows);



  option("theme", "default", function(cm) {

    themeChanged(cm);

    guttersChanged(cm);

  }, true);

  option("keyMap", "default", keyMapChanged);

  option("extraKeys", null);



  option("onKeyEvent", null);

  option("onDragEvent", null);



  option("lineWrapping", false, wrappingChanged, true);

  option("gutters", [], function(cm) {

    setGuttersForLineNumbers(cm.options);

    guttersChanged(cm);

  }, true);

  option("fixedGutter", true, function(cm, val) {

    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";

    cm.refresh();

  }, true);

  option("coverGutterNextToScrollbar", false, updateScrollbars, true);

  option("lineNumbers", false, function(cm) {

    setGuttersForLineNumbers(cm.options);

    guttersChanged(cm);

  }, true);

  option("firstLineNumber", 1, guttersChanged, true);

  option("lineNumberFormatter", function(integer) {return integer;}, guttersChanged, true);

  option("showCursorWhenSelecting", false, updateSelection, true);



  option("readOnly", false, function(cm, val) {

    if (val == "nocursor") {onBlur(cm); cm.display.input.blur();}

    else if (!val) resetInput(cm, true);

  });

  option("dragDrop", true);



  option("cursorBlinkRate", 530);

  option("cursorScrollMargin", 0);

  option("cursorHeight", 1);

  option("workTime", 100);

  option("workDelay", 100);

  option("flattenSpans", true);

  option("pollInterval", 100);

  option("undoDepth", 40, function(cm, val){cm.doc.history.undoDepth = val;});

  option("historyEventDelay", 500);

  option("viewportMargin", 10, function(cm){cm.refresh();}, true);

  option("maxHighlightLength", 10000, function(cm){loadMode(cm); cm.refresh();}, true);

  option("moveInputWithCursor", true, function(cm, val) {

    if (!val) cm.display.inputDiv.style.top = cm.display.inputDiv.style.left = 0;

  });



  option("tabindex", null, function(cm, val) {

    cm.display.input.tabIndex = val || "";

  });

  option("autofocus", null);



  // MODE DEFINITION AND QUERYING



  // Known modes, by name and by MIME

  var modes = CodeMirror.modes = {}, mimeModes = CodeMirror.mimeModes = {};



  CodeMirror.defineMode = function(name, mode) {

    if (!CodeMirror.defaults.mode && name != "null") CodeMirror.defaults.mode = name;

    if (arguments.length > 2) {

      mode.dependencies = [];

      for (var i = 2; i < arguments.length; ++i) mode.dependencies.push(arguments[i]);

    }

    modes[name] = mode;

  };



  CodeMirror.defineMIME = function(mime, spec) {

    mimeModes[mime] = spec;

  };



  CodeMirror.resolveMode = function(spec) {

    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {

      spec = mimeModes[spec];

    } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {

      var found = mimeModes[spec.name];

      spec = createObj(found, spec);

      spec.name = found.name;

    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {

      return CodeMirror.resolveMode("application/xml");

    }

    if (typeof spec == "string") return {name: spec};

    else return spec || {name: "null"};

  };



  CodeMirror.getMode = function(options, spec) {

    var spec = CodeMirror.resolveMode(spec);

    var mfactory = modes[spec.name];

    if (!mfactory) return CodeMirror.getMode(options, "text/plain");

    var modeObj = mfactory(options, spec);

    if (modeExtensions.hasOwnProperty(spec.name)) {

      var exts = modeExtensions[spec.name];

      for (var prop in exts) {

        if (!exts.hasOwnProperty(prop)) continue;

        if (modeObj.hasOwnProperty(prop)) modeObj["_" + prop] = modeObj[prop];

        modeObj[prop] = exts[prop];

      }

    }

    modeObj.name = spec.name;



    return modeObj;

  };



  CodeMirror.defineMode("null", function() {

    return {token: function(stream) {stream.skipToEnd();}};

  });

  CodeMirror.defineMIME("text/plain", "null");



  var modeExtensions = CodeMirror.modeExtensions = {};

  CodeMirror.extendMode = function(mode, properties) {

    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});

    copyObj(properties, exts);

  };



  // EXTENSIONS



  CodeMirror.defineExtension = function(name, func) {

    CodeMirror.prototype[name] = func;

  };

  CodeMirror.defineDocExtension = function(name, func) {

    Doc.prototype[name] = func;

  };

  CodeMirror.defineOption = option;



  var initHooks = [];

  CodeMirror.defineInitHook = function(f) {initHooks.push(f);};



  var helpers = CodeMirror.helpers = {};

  CodeMirror.registerHelper = function(type, name, value) {

    if (!helpers.hasOwnProperty(type)) helpers[type] = CodeMirror[type] = {};

    helpers[type][name] = value;

  };



  // UTILITIES



  CodeMirror.isWordChar = isWordChar;



  // MODE STATE HANDLING



  // Utility functions for working with state. Exported because modes

  // sometimes need to do this.

  function copyState(mode, state) {

    if (state === true) return state;

    if (mode.copyState) return mode.copyState(state);

    var nstate = {};

    for (var n in state) {

      var val = state[n];

      if (val instanceof Array) val = val.concat([]);

      nstate[n] = val;

    }

    return nstate;

  }

  CodeMirror.copyState = copyState;



  function startState(mode, a1, a2) {

    return mode.startState ? mode.startState(a1, a2) : true;

  }

  CodeMirror.startState = startState;



  CodeMirror.innerMode = function(mode, state) {

    while (mode.innerMode) {

      var info = mode.innerMode(state);

      if (!info || info.mode == mode) break;

      state = info.state;

      mode = info.mode;

    }

    return info || {mode: mode, state: state};

  };



  // STANDARD COMMANDS



  var commands = CodeMirror.commands = {

    selectAll: function(cm) {cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()));},

    killLine: function(cm) {

      var from = cm.getCursor(true), to = cm.getCursor(false), sel = !posEq(from, to);

      if (!sel && cm.getLine(from.line).length == from.ch)

        cm.replaceRange("", from, Pos(from.line + 1, 0), "+delete");

      else cm.replaceRange("", from, sel ? to : Pos(from.line), "+delete");

    },

    deleteLine: function(cm) {

      var l = cm.getCursor().line;

      cm.replaceRange("", Pos(l, 0), Pos(l), "+delete");

    },

    delLineLeft: function(cm) {

      var cur = cm.getCursor();

      cm.replaceRange("", Pos(cur.line, 0), cur, "+delete");

    },

    undo: function(cm) {cm.undo();},

    redo: function(cm) {cm.redo();},

    goDocStart: function(cm) {cm.extendSelection(Pos(cm.firstLine(), 0));},

    goDocEnd: function(cm) {cm.extendSelection(Pos(cm.lastLine()));},

    goLineStart: function(cm) {

      cm.extendSelection(lineStart(cm, cm.getCursor().line));

    },

    goLineStartSmart: function(cm) {

      var cur = cm.getCursor(), start = lineStart(cm, cur.line);

      var line = cm.getLineHandle(start.line);

      var order = getOrder(line);

      if (!order || order[0].level == 0) {

        var firstNonWS = Math.max(0, line.text.search(/\S/));

        var inWS = cur.line == start.line && cur.ch <= firstNonWS && cur.ch;

        cm.extendSelection(Pos(start.line, inWS ? 0 : firstNonWS));

      } else cm.extendSelection(start);

    },

    goLineEnd: function(cm) {

      cm.extendSelection(lineEnd(cm, cm.getCursor().line));

    },

    goLineRight: function(cm) {

      var top = cm.charCoords(cm.getCursor(), "div").top + 5;

      cm.extendSelection(cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div"));

    },

    goLineLeft: function(cm) {

      var top = cm.charCoords(cm.getCursor(), "div").top + 5;

      cm.extendSelection(cm.coordsChar({left: 0, top: top}, "div"));

    },

    goLineUp: function(cm) {cm.moveV(-1, "line");},

    goLineDown: function(cm) {cm.moveV(1, "line");},

    goPageUp: function(cm) {cm.moveV(-1, "page");},

    goPageDown: function(cm) {cm.moveV(1, "page");},

    goCharLeft: function(cm) {cm.moveH(-1, "char");},

    goCharRight: function(cm) {cm.moveH(1, "char");},

    goColumnLeft: function(cm) {cm.moveH(-1, "column");},

    goColumnRight: function(cm) {cm.moveH(1, "column");},

    goWordLeft: function(cm) {cm.moveH(-1, "word");},

    goGroupRight: function(cm) {cm.moveH(1, "group");},

    goGroupLeft: function(cm) {cm.moveH(-1, "group");},

    goWordRight: function(cm) {cm.moveH(1, "word");},

    delCharBefore: function(cm) {cm.deleteH(-1, "char");},

    delCharAfter: function(cm) {cm.deleteH(1, "char");},

    delWordBefore: function(cm) {cm.deleteH(-1, "word");},

    delWordAfter: function(cm) {cm.deleteH(1, "word");},

    delGroupBefore: function(cm) {cm.deleteH(-1, "group");},

    delGroupAfter: function(cm) {cm.deleteH(1, "group");},

    indentAuto: function(cm) {cm.indentSelection("smart");},

    indentMore: function(cm) {cm.indentSelection("add");},

    indentLess: function(cm) {cm.indentSelection("subtract");},

    insertTab: function(cm) {cm.replaceSelection("\t", "end", "+input");},

    defaultTab: function(cm) {

      if (cm.somethingSelected()) cm.indentSelection("add");

      else cm.replaceSelection("\t", "end", "+input");

    },

    transposeChars: function(cm) {

      var cur = cm.getCursor(), line = cm.getLine(cur.line);

      if (cur.ch > 0 && cur.ch < line.length - 1)

        cm.replaceRange(line.charAt(cur.ch) + line.charAt(cur.ch - 1),

                        Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1));

    },

    newlineAndIndent: function(cm) {

      operation(cm, function() {

        cm.replaceSelection("\n", "end", "+input");

        cm.indentLine(cm.getCursor().line, null, true);

      })();

    },

    toggleOverwrite: function(cm) {cm.toggleOverwrite();}

  };



  // STANDARD KEYMAPS



  var keyMap = CodeMirror.keyMap = {};

  keyMap.basic = {

    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",

    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",

    "Delete": "delCharAfter", "Backspace": "delCharBefore", "Tab": "defaultTab", "Shift-Tab": "indentAuto",

    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite"

  };

  // Note that the save and find-related commands aren't defined by

  // default. Unknown commands are simply ignored.

  keyMap.pcDefault = {

    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",

    "Ctrl-Home": "goDocStart", "Alt-Up": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Down": "goDocEnd",

    "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",

    "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",

    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",

    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",

    fallthrough: "basic"

  };

  keyMap.macDefault = {

    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",

    "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",

    "Alt-Right": "goGroupRight", "Cmd-Left": "goLineStart", "Cmd-Right": "goLineEnd", "Alt-Backspace": "delGroupBefore",

    "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",

    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",

    "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delLineLeft",

    fallthrough: ["basic", "emacsy"]

  };

  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

  keyMap.emacsy = {

    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",

    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",

    "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",

    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars"

  };



  // KEYMAP DISPATCH



  function getKeyMap(val) {

    if (typeof val == "string") return keyMap[val];

    else return val;

  }



  function lookupKey(name, maps, handle) {

    function lookup(map) {

      map = getKeyMap(map);

      var found = map[name];

      if (found === false) return "stop";

      if (found != null && handle(found)) return true;

      if (map.nofallthrough) return "stop";



      var fallthrough = map.fallthrough;

      if (fallthrough == null) return false;

      if (Object.prototype.toString.call(fallthrough) != "[object Array]")

        return lookup(fallthrough);

      for (var i = 0, e = fallthrough.length; i < e; ++i) {

        var done = lookup(fallthrough[i]);

        if (done) return done;

      }

      return false;

    }



    for (var i = 0; i < maps.length; ++i) {

      var done = lookup(maps[i]);

      if (done) return done != "stop";

    }

  }

  function isModifierKey(event) {

    var name = keyNames[event.keyCode];

    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod";

  }

  function keyName(event, noShift) {

    if (opera && event.keyCode == 34 && event["char"]) return false;

    var name = keyNames[event.keyCode];

    if (name == null || event.altGraphKey) return false;

    if (event.altKey) name = "Alt-" + name;

    if (flipCtrlCmd ? event.metaKey : event.ctrlKey) name = "Ctrl-" + name;

    if (flipCtrlCmd ? event.ctrlKey : event.metaKey) name = "Cmd-" + name;

    if (!noShift && event.shiftKey) name = "Shift-" + name;

    return name;

  }

  CodeMirror.lookupKey = lookupKey;

  CodeMirror.isModifierKey = isModifierKey;

  CodeMirror.keyName = keyName;



  // FROMTEXTAREA



  CodeMirror.fromTextArea = function(textarea, options) {

    if (!options) options = {};

    options.value = textarea.value;

    if (!options.tabindex && textarea.tabindex)

      options.tabindex = textarea.tabindex;

    if (!options.placeholder && textarea.placeholder)

      options.placeholder = textarea.placeholder;

    // Set autofocus to true if this textarea is focused, or if it has

    // autofocus and no other element is focused.

    if (options.autofocus == null) {

      var hasFocus = document.body;

      // doc.activeElement occasionally throws on IE

      try { hasFocus = document.activeElement; } catch(e) {}

      options.autofocus = hasFocus == textarea ||

        textarea.getAttribute("autofocus") != null && hasFocus == document.body;

    }



    function save() {textarea.value = cm.getValue();}

    if (textarea.form) {

      on(textarea.form, "submit", save);

      // Deplorable hack to make the submit method do the right thing.

      if (!options.leaveSubmitMethodAlone) {

        var form = textarea.form, realSubmit = form.submit;

        try {

          var wrappedSubmit = form.submit = function() {

            save();

            form.submit = realSubmit;

            form.submit();

            form.submit = wrappedSubmit;

          };

        } catch(e) {}

      }

    }



    textarea.style.display = "none";

    var cm = CodeMirror(function(node) {

      textarea.parentNode.insertBefore(node, textarea.nextSibling);

    }, options);

    cm.save = save;

    cm.getTextArea = function() { return textarea; };

    cm.toTextArea = function() {

      save();

      textarea.parentNode.removeChild(cm.getWrapperElement());

      textarea.style.display = "";

      if (textarea.form) {

        off(textarea.form, "submit", save);

        if (typeof textarea.form.submit == "function")

          textarea.form.submit = realSubmit;

      }

    };

    return cm;

  };



  // STRING STREAM



  // Fed to the mode parsers, provides helper functions to make

  // parsers more succinct.



  // The character stream used by a mode's parser.

  function StringStream(string, tabSize) {

    this.pos = this.start = 0;

    this.string = string;

    this.tabSize = tabSize || 8;

    this.lastColumnPos = this.lastColumnValue = 0;

  }



  StringStream.prototype = {

    eol: function() {return this.pos >= this.string.length;},

    sol: function() {return this.pos == 0;},

    peek: function() {return this.string.charAt(this.pos) || undefined;},

    next: function() {

      if (this.pos < this.string.length)

        return this.string.charAt(this.pos++);

    },

    eat: function(match) {

      var ch = this.string.charAt(this.pos);

      if (typeof match == "string") var ok = ch == match;

      else var ok = ch && (match.test ? match.test(ch) : match(ch));

      if (ok) {++this.pos; return ch;}

    },

    eatWhile: function(match) {

      var start = this.pos;

      while (this.eat(match)){}

      return this.pos > start;

    },

    eatSpace: function() {

      var start = this.pos;

      while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;

      return this.pos > start;

    },

    skipToEnd: function() {this.pos = this.string.length;},

    skipTo: function(ch) {

      var found = this.string.indexOf(ch, this.pos);

      if (found > -1) {this.pos = found; return true;}

    },

    backUp: function(n) {this.pos -= n;},

    column: function() {

      if (this.lastColumnPos < this.start) {

        this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);

        this.lastColumnPos = this.start;

      }

      return this.lastColumnValue;

    },

    indentation: function() {return countColumn(this.string, null, this.tabSize);},

    match: function(pattern, consume, caseInsensitive) {

      if (typeof pattern == "string") {

        var cased = function(str) {return caseInsensitive ? str.toLowerCase() : str;};

        var substr = this.string.substr(this.pos, pattern.length);

        if (cased(substr) == cased(pattern)) {

          if (consume !== false) this.pos += pattern.length;

          return true;

        }

      } else {

        var match = this.string.slice(this.pos).match(pattern);

        if (match && match.index > 0) return null;

        if (match && consume !== false) this.pos += match[0].length;

        return match;

      }

    },

    current: function(){return this.string.slice(this.start, this.pos);}

  };

  CodeMirror.StringStream = StringStream;



  // TEXTMARKERS



  function TextMarker(doc, type) {

    this.lines = [];

    this.type = type;

    this.doc = doc;

  }

  CodeMirror.TextMarker = TextMarker;

  eventMixin(TextMarker);



  TextMarker.prototype.clear = function() {

    if (this.explicitlyCleared) return;

    var cm = this.doc.cm, withOp = cm && !cm.curOp;

    if (withOp) startOperation(cm);

    if (hasHandler(this, "clear")) {

      var found = this.find();

      if (found) signalLater(this, "clear", found.from, found.to);

    }

    var min = null, max = null;

    for (var i = 0; i < this.lines.length; ++i) {

      var line = this.lines[i];

      var span = getMarkedSpanFor(line.markedSpans, this);

      if (span.to != null) max = lineNo(line);

      line.markedSpans = removeMarkedSpan(line.markedSpans, span);

      if (span.from != null)

        min = lineNo(line);

      else if (this.collapsed && !lineIsHidden(this.doc, line) && cm)

        updateLineHeight(line, textHeight(cm.display));

    }

    if (cm && this.collapsed && !cm.options.lineWrapping) for (var i = 0; i < this.lines.length; ++i) {

      var visual = visualLine(cm.doc, this.lines[i]), len = lineLength(cm.doc, visual);

      if (len > cm.display.maxLineLength) {

        cm.display.maxLine = visual;

        cm.display.maxLineLength = len;

        cm.display.maxLineChanged = true;

      }

    }



    if (min != null && cm) regChange(cm, min, max + 1);

    this.lines.length = 0;

    this.explicitlyCleared = true;

    if (this.atomic && this.doc.cantEdit) {

      this.doc.cantEdit = false;

      if (cm) reCheckSelection(cm);

    }

    if (withOp) endOperation(cm);

  };



  TextMarker.prototype.find = function() {

    var from, to;

    for (var i = 0; i < this.lines.length; ++i) {

      var line = this.lines[i];

      var span = getMarkedSpanFor(line.markedSpans, this);

      if (span.from != null || span.to != null) {

        var found = lineNo(line);

        if (span.from != null) from = Pos(found, span.from);

        if (span.to != null) to = Pos(found, span.to);

      }

    }

    if (this.type == "bookmark") return from;

    return from && {from: from, to: to};

  };



  TextMarker.prototype.changed = function() {

    var pos = this.find(), cm = this.doc.cm;

    if (!pos || !cm) return;

    if (this.type != "bookmark") pos = pos.from;

    var line = getLine(this.doc, pos.line);

    clearCachedMeasurement(cm, line);

    if (pos.line >= cm.display.showingFrom && pos.line < cm.display.showingTo) {

      for (var node = cm.display.lineDiv.firstChild; node; node = node.nextSibling) if (node.lineObj == line) {

        if (node.offsetHeight != line.height) updateLineHeight(line, node.offsetHeight);

        break;

      }

      runInOp(cm, function() {

        cm.curOp.selectionChanged = cm.curOp.forceUpdate = cm.curOp.updateMaxLine = true;

      });

    }

  };



  TextMarker.prototype.attachLine = function(line) {

    if (!this.lines.length && this.doc.cm) {

      var op = this.doc.cm.curOp;

      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)

        (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this);

    }

    this.lines.push(line);

  };

  TextMarker.prototype.detachLine = function(line) {

    this.lines.splice(indexOf(this.lines, line), 1);

    if (!this.lines.length && this.doc.cm) {

      var op = this.doc.cm.curOp;

      (op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);

    }

  };



  function markText(doc, from, to, options, type) {

    if (options && options.shared) return markTextShared(doc, from, to, options, type);

    if (doc.cm && !doc.cm.curOp) return operation(doc.cm, markText)(doc, from, to, options, type);



    var marker = new TextMarker(doc, type);

    if (type == "range" && !posLess(from, to)) return marker;

    if (options) copyObj(options, marker);

    if (marker.replacedWith) {

      marker.collapsed = true;

      marker.replacedWith = elt("span", [marker.replacedWith], "CodeMirror-widget");

      if (!options.handleMouseEvents) marker.replacedWith.ignoreEvents = true;

    }

    if (marker.collapsed) sawCollapsedSpans = true;



    if (marker.addToHistory)

      addToHistory(doc, {from: from, to: to, origin: "markText"},

                   {head: doc.sel.head, anchor: doc.sel.anchor}, NaN);



    var curLine = from.line, size = 0, collapsedAtStart, collapsedAtEnd, cm = doc.cm, updateMaxLine;

    doc.iter(curLine, to.line + 1, function(line) {

      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(doc, line) == cm.display.maxLine)

        updateMaxLine = true;

      var span = {from: null, to: null, marker: marker};

      size += line.text.length;

      if (curLine == from.line) {span.from = from.ch; size -= from.ch;}

      if (curLine == to.line) {span.to = to.ch; size -= line.text.length - to.ch;}

      if (marker.collapsed) {

        if (curLine == to.line) collapsedAtEnd = collapsedSpanAt(line, to.ch);

        if (curLine == from.line) collapsedAtStart = collapsedSpanAt(line, from.ch);

        else updateLineHeight(line, 0);

      }

      addMarkedSpan(line, span);

      ++curLine;

    });

    if (marker.collapsed) doc.iter(from.line, to.line + 1, function(line) {

      if (lineIsHidden(doc, line)) updateLineHeight(line, 0);

    });



    if (marker.clearOnEnter) on(marker, "beforeCursorEnter", function() { marker.clear(); });



    if (marker.readOnly) {

      sawReadOnlySpans = true;

      if (doc.history.done.length || doc.history.undone.length)

        doc.clearHistory();

    }

    if (marker.collapsed) {

      if (collapsedAtStart != collapsedAtEnd)

        throw new Error("Inserting collapsed marker overlapping an existing one");

      marker.size = size;

      marker.atomic = true;

    }

    if (cm) {

      if (updateMaxLine) cm.curOp.updateMaxLine = true;

      if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.collapsed)

        regChange(cm, from.line, to.line + 1);

      if (marker.atomic) reCheckSelection(cm);

    }

    return marker;

  }



  // SHARED TEXTMARKERS



  function SharedTextMarker(markers, primary) {

    this.markers = markers;

    this.primary = primary;

    for (var i = 0, me = this; i < markers.length; ++i) {

      markers[i].parent = this;

      on(markers[i], "clear", function(){me.clear();});

    }

  }

  CodeMirror.SharedTextMarker = SharedTextMarker;

  eventMixin(SharedTextMarker);



  SharedTextMarker.prototype.clear = function() {

    if (this.explicitlyCleared) return;

    this.explicitlyCleared = true;

    for (var i = 0; i < this.markers.length; ++i)

      this.markers[i].clear();

    signalLater(this, "clear");

  };

  SharedTextMarker.prototype.find = function() {

    return this.primary.find();

  };



  function markTextShared(doc, from, to, options, type) {

    options = copyObj(options);

    options.shared = false;

    var markers = [markText(doc, from, to, options, type)], primary = markers[0];

    var widget = options.replacedWith;

    linkedDocs(doc, function(doc) {

      if (widget) options.replacedWith = widget.cloneNode(true);

      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));

      for (var i = 0; i < doc.linked.length; ++i)

        if (doc.linked[i].isParent) return;

      primary = lst(markers);

    });

    return new SharedTextMarker(markers, primary);

  }



  // TEXTMARKER SPANS



  function getMarkedSpanFor(spans, marker) {

    if (spans) for (var i = 0; i < spans.length; ++i) {

      var span = spans[i];

      if (span.marker == marker) return span;

    }

  }

  function removeMarkedSpan(spans, span) {

    for (var r, i = 0; i < spans.length; ++i)

      if (spans[i] != span) (r || (r = [])).push(spans[i]);

    return r;

  }

  function addMarkedSpan(line, span) {

    line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];

    span.marker.attachLine(line);

  }



  function markedSpansBefore(old, startCh, isInsert) {

    if (old) for (var i = 0, nw; i < old.length; ++i) {

      var span = old[i], marker = span.marker;

      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);

      if (startsBefore || marker.type == "bookmark" && span.from == startCh && (!isInsert || !span.marker.insertLeft)) {

        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);

        (nw || (nw = [])).push({from: span.from,

                                to: endsAfter ? null : span.to,

                                marker: marker});

      }

    }

    return nw;

  }



  function markedSpansAfter(old, endCh, isInsert) {

    if (old) for (var i = 0, nw; i < old.length; ++i) {

      var span = old[i], marker = span.marker;

      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);

      if (endsAfter || marker.type == "bookmark" && span.from == endCh && (!isInsert || span.marker.insertLeft)) {

        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);

        (nw || (nw = [])).push({from: startsBefore ? null : span.from - endCh,

                                to: span.to == null ? null : span.to - endCh,

                                marker: marker});

      }

    }

    return nw;

  }



  function stretchSpansOverChange(doc, change) {

    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;

    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;

    if (!oldFirst && !oldLast) return null;



    var startCh = change.from.ch, endCh = change.to.ch, isInsert = posEq(change.from, change.to);

    // Get the spans that 'stick out' on both sides

    var first = markedSpansBefore(oldFirst, startCh, isInsert);

    var last = markedSpansAfter(oldLast, endCh, isInsert);



    // Next, merge those two ends

    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);

    if (first) {

      // Fix up .to properties of first

      for (var i = 0; i < first.length; ++i) {

        var span = first[i];

        if (span.to == null) {

          var found = getMarkedSpanFor(last, span.marker);

          if (!found) span.to = startCh;

          else if (sameLine) span.to = found.to == null ? null : found.to + offset;

        }

      }

    }

    if (last) {

      // Fix up .from in last (or move them into first in case of sameLine)

      for (var i = 0; i < last.length; ++i) {

        var span = last[i];

        if (span.to != null) span.to += offset;

        if (span.from == null) {

          var found = getMarkedSpanFor(first, span.marker);

          if (!found) {

            span.from = offset;

            if (sameLine) (first || (first = [])).push(span);

          }

        } else {

          span.from += offset;

          if (sameLine) (first || (first = [])).push(span);

        }

      }

    }

    if (sameLine && first) {

      // Make sure we didn't create any zero-length spans

      for (var i = 0; i < first.length; ++i)

        if (first[i].from != null && first[i].from == first[i].to && first[i].marker.type != "bookmark")

          first.splice(i--, 1);

      if (!first.length) first = null;

    }



    var newMarkers = [first];

    if (!sameLine) {

      // Fill gap with whole-line-spans

      var gap = change.text.length - 2, gapMarkers;

      if (gap > 0 && first)

        for (var i = 0; i < first.length; ++i)

          if (first[i].to == null)

            (gapMarkers || (gapMarkers = [])).push({from: null, to: null, marker: first[i].marker});

      for (var i = 0; i < gap; ++i)

        newMarkers.push(gapMarkers);

      newMarkers.push(last);

    }

    return newMarkers;

  }



  function mergeOldSpans(doc, change) {

    var old = getOldSpans(doc, change);

    var stretched = stretchSpansOverChange(doc, change);

    if (!old) return stretched;

    if (!stretched) return old;



    for (var i = 0; i < old.length; ++i) {

      var oldCur = old[i], stretchCur = stretched[i];

      if (oldCur && stretchCur) {

        spans: for (var j = 0; j < stretchCur.length; ++j) {

          var span = stretchCur[j];

          for (var k = 0; k < oldCur.length; ++k)

            if (oldCur[k].marker == span.marker) continue spans;

          oldCur.push(span);

        }

      } else if (stretchCur) {

        old[i] = stretchCur;

      }

    }

    return old;

  }



  function removeReadOnlyRanges(doc, from, to) {

    var markers = null;

    doc.iter(from.line, to.line + 1, function(line) {

      if (line.markedSpans) for (var i = 0; i < line.markedSpans.length; ++i) {

        var mark = line.markedSpans[i].marker;

        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))

          (markers || (markers = [])).push(mark);

      }

    });

    if (!markers) return null;

    var parts = [{from: from, to: to}];

    for (var i = 0; i < markers.length; ++i) {

      var mk = markers[i], m = mk.find();

      for (var j = 0; j < parts.length; ++j) {

        var p = parts[j];

        if (posLess(p.to, m.from) || posLess(m.to, p.from)) continue;

        var newParts = [j, 1];

        if (posLess(p.from, m.from) || !mk.inclusiveLeft && posEq(p.from, m.from))

          newParts.push({from: p.from, to: m.from});

        if (posLess(m.to, p.to) || !mk.inclusiveRight && posEq(p.to, m.to))

          newParts.push({from: m.to, to: p.to});

        parts.splice.apply(parts, newParts);

        j += newParts.length - 1;

      }

    }

    return parts;

  }



  function collapsedSpanAt(line, ch) {

    var sps = sawCollapsedSpans && line.markedSpans, found;

    if (sps) for (var sp, i = 0; i < sps.length; ++i) {

      sp = sps[i];

      if (!sp.marker.collapsed) continue;

      if ((sp.from == null || sp.from < ch) &&

          (sp.to == null || sp.to > ch) &&

          (!found || found.width < sp.marker.width))

        found = sp.marker;

    }

    return found;

  }

  function collapsedSpanAtStart(line) { return collapsedSpanAt(line, -1); }

  function collapsedSpanAtEnd(line) { return collapsedSpanAt(line, line.text.length + 1); }



  function visualLine(doc, line) {

    var merged;

    while (merged = collapsedSpanAtStart(line))

      line = getLine(doc, merged.find().from.line);

    return line;

  }



  function lineIsHidden(doc, line) {

    var sps = sawCollapsedSpans && line.markedSpans;

    if (sps) for (var sp, i = 0; i < sps.length; ++i) {

      sp = sps[i];

      if (!sp.marker.collapsed) continue;

      if (sp.from == null) return true;

      if (sp.marker.replacedWith) continue;

      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))

        return true;

    }

  }

  function lineIsHiddenInner(doc, line, span) {

    if (span.to == null) {

      var end = span.marker.find().to, endLine = getLine(doc, end.line);

      return lineIsHiddenInner(doc, endLine, getMarkedSpanFor(endLine.markedSpans, span.marker));

    }

    if (span.marker.inclusiveRight && span.to == line.text.length)

      return true;

    for (var sp, i = 0; i < line.markedSpans.length; ++i) {

      sp = line.markedSpans[i];

      if (sp.marker.collapsed && !sp.marker.replacedWith && sp.from == span.to &&

          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&

          lineIsHiddenInner(doc, line, sp)) return true;

    }

  }



  function detachMarkedSpans(line) {

    var spans = line.markedSpans;

    if (!spans) return;

    for (var i = 0; i < spans.length; ++i)

      spans[i].marker.detachLine(line);

    line.markedSpans = null;

  }



  function attachMarkedSpans(line, spans) {

    if (!spans) return;

    for (var i = 0; i < spans.length; ++i)

      spans[i].marker.attachLine(line);

    line.markedSpans = spans;

  }



  // LINE WIDGETS



  var LineWidget = CodeMirror.LineWidget = function(cm, node, options) {

    if (options) for (var opt in options) if (options.hasOwnProperty(opt))

      this[opt] = options[opt];

    this.cm = cm;

    this.node = node;

  };

  eventMixin(LineWidget);

  function widgetOperation(f) {

    return function() {

      var withOp = !this.cm.curOp;

      if (withOp) startOperation(this.cm);

      try {var result = f.apply(this, arguments);}

      finally {if (withOp) endOperation(this.cm);}

      return result;

    };

  }

  LineWidget.prototype.clear = widgetOperation(function() {

    var ws = this.line.widgets, no = lineNo(this.line);

    if (no == null || !ws) return;

    for (var i = 0; i < ws.length; ++i) if (ws[i] == this) ws.splice(i--, 1);

    if (!ws.length) this.line.widgets = null;

    var aboveVisible = heightAtLine(this.cm, this.line) < this.cm.doc.scrollTop;

    updateLineHeight(this.line, Math.max(0, this.line.height - widgetHeight(this)));

    if (aboveVisible) addToScrollPos(this.cm, 0, -this.height);

    regChange(this.cm, no, no + 1);

  });

  LineWidget.prototype.changed = widgetOperation(function() {

    var oldH = this.height;

    this.height = null;

    var diff = widgetHeight(this) - oldH;

    if (!diff) return;

    updateLineHeight(this.line, this.line.height + diff);

    var no = lineNo(this.line);

    regChange(this.cm, no, no + 1);

  });



  function widgetHeight(widget) {

    if (widget.height != null) return widget.height;

    if (!widget.node.parentNode || widget.node.parentNode.nodeType != 1)

      removeChildrenAndAdd(widget.cm.display.measure, elt("div", [widget.node], null, "position: relative"));

    return widget.height = widget.node.offsetHeight;

  }



  function addLineWidget(cm, handle, node, options) {

    var widget = new LineWidget(cm, node, options);

    if (widget.noHScroll) cm.display.alignWidgets = true;

    changeLine(cm, handle, function(line) {

      var widgets = line.widgets || (line.widgets = []);

      if (widget.insertAt == null) widgets.push(widget);

      else widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget);

      widget.line = line;

      if (!lineIsHidden(cm.doc, line) || widget.showIfHidden) {

        var aboveVisible = heightAtLine(cm, line) < cm.doc.scrollTop;

        updateLineHeight(line, line.height + widgetHeight(widget));

        if (aboveVisible) addToScrollPos(cm, 0, widget.height);

      }

      return true;

    });

    return widget;

  }



  // LINE DATA STRUCTURE



  // Line objects. These hold state related to a line, including

  // highlighting info (the styles array).

  var Line = CodeMirror.Line = function(text, markedSpans, estimateHeight) {

    this.text = text;

    attachMarkedSpans(this, markedSpans);

    this.height = estimateHeight ? estimateHeight(this) : 1;

  };

  eventMixin(Line);



  function updateLine(line, text, markedSpans, estimateHeight) {

    line.text = text;

    if (line.stateAfter) line.stateAfter = null;

    if (line.styles) line.styles = null;

    if (line.order != null) line.order = null;

    detachMarkedSpans(line);

    attachMarkedSpans(line, markedSpans);

    var estHeight = estimateHeight ? estimateHeight(line) : 1;

    if (estHeight != line.height) updateLineHeight(line, estHeight);

  }



  function cleanUpLine(line) {

    line.parent = null;

    detachMarkedSpans(line);

  }



  // Run the given mode's parser over a line, update the styles

  // array, which contains alternating fragments of text and CSS

  // classes.

  function runMode(cm, text, mode, state, f) {

    var flattenSpans = mode.flattenSpans;

    if (flattenSpans == null) flattenSpans = cm.options.flattenSpans;

    var curStart = 0, curStyle = null;

    var stream = new StringStream(text, cm.options.tabSize), style;

    if (text == "" && mode.blankLine) mode.blankLine(state);

    while (!stream.eol()) {

      if (stream.pos > cm.options.maxHighlightLength) {

        flattenSpans = false;

        // Webkit seems to refuse to render text nodes longer than 57444 characters

        stream.pos = Math.min(text.length, stream.start + 50000);

        style = null;

      } else {

        style = mode.token(stream, state);

      }

      if (!flattenSpans || curStyle != style) {

        if (curStart < stream.start) f(stream.start, curStyle);

        curStart = stream.start; curStyle = style;

      }

      stream.start = stream.pos;

    }

    if (curStart < stream.pos) f(stream.pos, curStyle);

  }



  function highlightLine(cm, line, state) {

    // A styles array always starts with a number identifying the

    // mode/overlays that it is based on (for easy invalidation).

    var st = [cm.state.modeGen];

    // Compute the base array of styles

    runMode(cm, line.text, cm.doc.mode, state, function(end, style) {st.push(end, style);});



    // Run overlays, adjust style array.

    for (var o = 0; o < cm.state.overlays.length; ++o) {

      var overlay = cm.state.overlays[o], i = 1, at = 0;

      runMode(cm, line.text, overlay.mode, true, function(end, style) {

        var start = i;

        // Ensure there's a token end at the current position, and that i points at it

        while (at < end) {

          var i_end = st[i];

          if (i_end > end)

            st.splice(i, 1, end, st[i+1], i_end);

          i += 2;

          at = Math.min(end, i_end);

        }

        if (!style) return;

        if (overlay.opaque) {

          st.splice(start, i - start, end, style);

          i = start + 2;

        } else {

          for (; start < i; start += 2) {

            var cur = st[start+1];

            st[start+1] = cur ? cur + " " + style : style;

          }

        }

      });

    }



    return st;

  }



  function getLineStyles(cm, line) {

    if (!line.styles || line.styles[0] != cm.state.modeGen)

      line.styles = highlightLine(cm, line, line.stateAfter = getStateBefore(cm, lineNo(line)));

    return line.styles;

  }



  // Lightweight form of highlight -- proceed over this line and

  // update state, but don't save a style array.

  function processLine(cm, line, state) {

    var mode = cm.doc.mode;

    var stream = new StringStream(line.text, cm.options.tabSize);

    if (line.text == "" && mode.blankLine) mode.blankLine(state);

    while (!stream.eol() && stream.pos <= cm.options.maxHighlightLength) {

      mode.token(stream, state);

      stream.start = stream.pos;

    }

  }



  var styleToClassCache = {};

  function styleToClass(style) {

    if (!style) return null;

    return styleToClassCache[style] ||

      (styleToClassCache[style] = "cm-" + style.replace(/ +/g, " cm-"));

  }



  function lineContent(cm, realLine, measure, copyWidgets) {

    var merged, line = realLine, empty = true;

    while (merged = collapsedSpanAtStart(line))

      line = getLine(cm.doc, merged.find().from.line);



    var builder = {pre: elt("pre"), col: 0, pos: 0,

                   measure: null, measuredSomething: false, cm: cm,

                   copyWidgets: copyWidgets};

    if (line.textClass) builder.pre.className = line.textClass;



    do {

      if (line.text) empty = false;

      builder.measure = line == realLine && measure;

      builder.pos = 0;

      builder.addToken = builder.measure ? buildTokenMeasure : buildToken;

      if ((ie || webkit) && cm.getOption("lineWrapping"))

        builder.addToken = buildTokenSplitSpaces(builder.addToken);

      var next = insertLineContent(line, builder, getLineStyles(cm, line));

      if (measure && line == realLine && !builder.measuredSomething) {

        measure[0] = builder.pre.appendChild(zeroWidthElement(cm.display.measure));

        builder.measuredSomething = true;

      }

      if (next) line = getLine(cm.doc, next.to.line);

    } while (next);



    if (measure && !builder.measuredSomething && !measure[0])

      measure[0] = builder.pre.appendChild(empty ? elt("span", "\u00a0") : zeroWidthElement(cm.display.measure));

    if (!builder.pre.firstChild && !lineIsHidden(cm.doc, realLine))

      builder.pre.appendChild(document.createTextNode("\u00a0"));



    var order;

    // Work around problem with the reported dimensions of single-char

    // direction spans on IE (issue #1129). See also the comment in

    // cursorCoords.

    if (measure && ie && (order = getOrder(line))) {

      var l = order.length - 1;

      if (order[l].from == order[l].to) --l;

      var last = order[l], prev = order[l - 1];

      if (last.from + 1 == last.to && prev && last.level < prev.level) {

        var span = measure[builder.pos - 1];

        if (span) span.parentNode.insertBefore(span.measureRight = zeroWidthElement(cm.display.measure),

                                               span.nextSibling);

      }

    }



    signal(cm, "renderLine", cm, realLine, builder.pre);

    return builder.pre;

  }



  var tokenSpecialChars = /[\t\u0000-\u0019\u00ad\u200b\u2028\u2029\uFEFF]/g;

  function buildToken(builder, text, style, startStyle, endStyle, title) {

    if (!text) return;

    if (!tokenSpecialChars.test(text)) {

      builder.col += text.length;

      var content = document.createTextNode(text);

    } else {

      var content = document.createDocumentFragment(), pos = 0;

      while (true) {

        tokenSpecialChars.lastIndex = pos;

        var m = tokenSpecialChars.exec(text);

        var skipped = m ? m.index - pos : text.length - pos;

        if (skipped) {

          content.appendChild(document.createTextNode(text.slice(pos, pos + skipped)));

          builder.col += skipped;

        }

        if (!m) break;

        pos += skipped + 1;

        if (m[0] == "\t") {

          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;

          content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));

          builder.col += tabWidth;

        } else {

          var token = elt("span", "\u2022", "cm-invalidchar");

          token.title = "\\u" + m[0].charCodeAt(0).toString(16);

          content.appendChild(token);

          builder.col += 1;

        }

      }

    }

    if (style || startStyle || endStyle || builder.measure) {

      var fullStyle = style || "";

      if (startStyle) fullStyle += startStyle;

      if (endStyle) fullStyle += endStyle;

      var token = elt("span", [content], fullStyle);

      if (title) token.title = title;

      return builder.pre.appendChild(token);

    }

    builder.pre.appendChild(content);

  }



  function buildTokenMeasure(builder, text, style, startStyle, endStyle) {

    var wrapping = builder.cm.options.lineWrapping;

    for (var i = 0; i < text.length; ++i) {

      var ch = text.charAt(i), start = i == 0;

      if (ch >= "\ud800" && ch < "\udbff" && i < text.length - 1) {

        ch = text.slice(i, i + 2);

        ++i;

      } else if (i && wrapping && spanAffectsWrapping(text, i)) {

        builder.pre.appendChild(elt("wbr"));

      }

      var old = builder.measure[builder.pos];

      var span = builder.measure[builder.pos] =

        buildToken(builder, ch, style,

                   start && startStyle, i == text.length - 1 && endStyle);

      if (old) span.leftSide = old.leftSide || old;

      // In IE single-space nodes wrap differently than spaces

      // embedded in larger text nodes, except when set to

      // white-space: normal (issue #1268).

      if (ie && wrapping && ch == " " && i && !/\s/.test(text.charAt(i - 1)) &&

          i < text.length - 1 && !/\s/.test(text.charAt(i + 1)))

        span.style.whiteSpace = "normal";

      builder.pos += ch.length;

    }

    if (text.length) builder.measuredSomething = true;

  }



  function buildTokenSplitSpaces(inner) {

    function split(old) {

      var out = " ";

      for (var i = 0; i < old.length - 2; ++i) out += i % 2 ? " " : "\u00a0";

      out += " ";

      return out;

    }

    return function(builder, text, style, startStyle, endStyle, title) {

      return inner(builder, text.replace(/ {3,}/, split), style, startStyle, endStyle, title);

    };

  }



  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {

    var widget = !ignoreWidget && marker.replacedWith;

    if (widget) {

      if (builder.copyWidgets) widget = widget.cloneNode(true);

      builder.pre.appendChild(widget);

      if (builder.measure) {

        if (size) {

          builder.measure[builder.pos] = widget;

        } else {

          var elt = zeroWidthElement(builder.cm.display.measure);

          if (marker.type == "bookmark" && !marker.insertLeft)

            builder.measure[builder.pos] = builder.pre.appendChild(elt);

          else if (builder.measure[builder.pos])

            return;

          else

            builder.measure[builder.pos] = builder.pre.insertBefore(elt, widget);

        }

        builder.measuredSomething = true;

      }

    }

    builder.pos += size;

  }



  // Outputs a number of spans to make up a line, taking highlighting

  // and marked text into account.

  function insertLineContent(line, builder, styles) {

    var spans = line.markedSpans, allText = line.text, at = 0;

    if (!spans) {

      for (var i = 1; i < styles.length; i+=2)

        builder.addToken(builder, allText.slice(at, at = styles[i]), styleToClass(styles[i+1]));

      return;

    }



    var len = allText.length, pos = 0, i = 1, text = "", style;

    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;

    for (;;) {

      if (nextChange == pos) { // Update current marker set

        spanStyle = spanEndStyle = spanStartStyle = title = "";

        collapsed = null; nextChange = Infinity;

        var foundBookmarks = [];

        for (var j = 0; j < spans.length; ++j) {

          var sp = spans[j], m = sp.marker;

          if (sp.from <= pos && (sp.to == null || sp.to > pos)) {

            if (sp.to != null && nextChange > sp.to) { nextChange = sp.to; spanEndStyle = ""; }

            if (m.className) spanStyle += " " + m.className;

            if (m.startStyle && sp.from == pos) spanStartStyle += " " + m.startStyle;

            if (m.endStyle && sp.to == nextChange) spanEndStyle += " " + m.endStyle;

            if (m.title && !title) title = m.title;

            if (m.collapsed && (!collapsed || collapsed.marker.size < m.size))

              collapsed = sp;

          } else if (sp.from > pos && nextChange > sp.from) {

            nextChange = sp.from;

          }

          if (m.type == "bookmark" && sp.from == pos && m.replacedWith) foundBookmarks.push(m);

        }

        if (collapsed && (collapsed.from || 0) == pos) {

          buildCollapsedSpan(builder, (collapsed.to == null ? len : collapsed.to) - pos,

                             collapsed.marker, collapsed.from == null);

          if (collapsed.to == null) return collapsed.marker.find();

        }

        if (!collapsed && foundBookmarks.length) for (var j = 0; j < foundBookmarks.length; ++j)

          buildCollapsedSpan(builder, 0, foundBookmarks[j]);

      }

      if (pos >= len) break;



      var upto = Math.min(len, nextChange);

      while (true) {

        if (text) {

          var end = pos + text.length;

          if (!collapsed) {

            var tokenText = end > upto ? text.slice(0, upto - pos) : text;

            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,

                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title);

          }

          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break;}

          pos = end;

          spanStartStyle = "";

        }

        text = allText.slice(at, at = styles[i++]);

        style = styleToClass(styles[i++]);

      }

    }

  }



  // DOCUMENT DATA STRUCTURE



  function updateDoc(doc, change, markedSpans, selAfter, estimateHeight) {

    function spansFor(n) {return markedSpans ? markedSpans[n] : null;}

    function update(line, text, spans) {

      updateLine(line, text, spans, estimateHeight);

      signalLater(line, "change", line, change);

    }



    var from = change.from, to = change.to, text = change.text;

    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);

    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;



    // First adjust the line structure

    if (from.ch == 0 && to.ch == 0 && lastText == "") {

      // This is a whole-line replace. Treated specially to make

      // sure line objects move the way they are supposed to.

      for (var i = 0, e = text.length - 1, added = []; i < e; ++i)

        added.push(new Line(text[i], spansFor(i), estimateHeight));

      update(lastLine, lastLine.text, lastSpans);

      if (nlines) doc.remove(from.line, nlines);

      if (added.length) doc.insert(from.line, added);

    } else if (firstLine == lastLine) {

      if (text.length == 1) {

        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);

      } else {

        for (var added = [], i = 1, e = text.length - 1; i < e; ++i)

          added.push(new Line(text[i], spansFor(i), estimateHeight));

        added.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));

        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));

        doc.insert(from.line + 1, added);

      }

    } else if (text.length == 1) {

      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));

      doc.remove(from.line + 1, nlines);

    } else {

      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));

      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);

      for (var i = 1, e = text.length - 1, added = []; i < e; ++i)

        added.push(new Line(text[i], spansFor(i), estimateHeight));

      if (nlines > 1) doc.remove(from.line + 1, nlines - 1);

      doc.insert(from.line + 1, added);

    }



    signalLater(doc, "change", doc, change);

    setSelection(doc, selAfter.anchor, selAfter.head, null, true);

  }



  function LeafChunk(lines) {

    this.lines = lines;

    this.parent = null;

    for (var i = 0, e = lines.length, height = 0; i < e; ++i) {

      lines[i].parent = this;

      height += lines[i].height;

    }

    this.height = height;

  }



  LeafChunk.prototype = {

    chunkSize: function() { return this.lines.length; },

    removeInner: function(at, n) {

      for (var i = at, e = at + n; i < e; ++i) {

        var line = this.lines[i];

        this.height -= line.height;

        cleanUpLine(line);

        signalLater(line, "delete");

      }

      this.lines.splice(at, n);

    },

    collapse: function(lines) {

      lines.splice.apply(lines, [lines.length, 0].concat(this.lines));

    },

    insertInner: function(at, lines, height) {

      this.height += height;

      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));

      for (var i = 0, e = lines.length; i < e; ++i) lines[i].parent = this;

    },

    iterN: function(at, n, op) {

      for (var e = at + n; at < e; ++at)

        if (op(this.lines[at])) return true;

    }

  };



  function BranchChunk(children) {

    this.children = children;

    var size = 0, height = 0;

    for (var i = 0, e = children.length; i < e; ++i) {

      var ch = children[i];

      size += ch.chunkSize(); height += ch.height;

      ch.parent = this;

    }

    this.size = size;

    this.height = height;

    this.parent = null;

  }



  BranchChunk.prototype = {

    chunkSize: function() { return this.size; },

    removeInner: function(at, n) {

      this.size -= n;

      for (var i = 0; i < this.children.length; ++i) {

        var child = this.children[i], sz = child.chunkSize();

        if (at < sz) {

          var rm = Math.min(n, sz - at), oldHeight = child.height;

          child.removeInner(at, rm);

          this.height -= oldHeight - child.height;

          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }

          if ((n -= rm) == 0) break;

          at = 0;

        } else at -= sz;

      }

      if (this.size - n < 25) {

        var lines = [];

        this.collapse(lines);

        this.children = [new LeafChunk(lines)];

        this.children[0].parent = this;

      }

    },

    collapse: function(lines) {

      for (var i = 0, e = this.children.length; i < e; ++i) this.children[i].collapse(lines);

    },

    insertInner: function(at, lines, height) {

      this.size += lines.length;

      this.height += height;

      for (var i = 0, e = this.children.length; i < e; ++i) {

        var child = this.children[i], sz = child.chunkSize();

        if (at <= sz) {

          child.insertInner(at, lines, height);

          if (child.lines && child.lines.length > 50) {

            while (child.lines.length > 50) {

              var spilled = child.lines.splice(child.lines.length - 25, 25);

              var newleaf = new LeafChunk(spilled);

              child.height -= newleaf.height;

              this.children.splice(i + 1, 0, newleaf);

              newleaf.parent = this;

            }

            this.maybeSpill();

          }

          break;

        }

        at -= sz;

      }

    },

    maybeSpill: function() {

      if (this.children.length <= 10) return;

      var me = this;

      do {

        var spilled = me.children.splice(me.children.length - 5, 5);

        var sibling = new BranchChunk(spilled);

        if (!me.parent) { // Become the parent node

          var copy = new BranchChunk(me.children);

          copy.parent = me;

          me.children = [copy, sibling];

          me = copy;

        } else {

          me.size -= sibling.size;

          me.height -= sibling.height;

          var myIndex = indexOf(me.parent.children, me);

          me.parent.children.splice(myIndex + 1, 0, sibling);

        }

        sibling.parent = me.parent;

      } while (me.children.length > 10);

      me.parent.maybeSpill();

    },

    iterN: function(at, n, op) {

      for (var i = 0, e = this.children.length; i < e; ++i) {

        var child = this.children[i], sz = child.chunkSize();

        if (at < sz) {

          var used = Math.min(n, sz - at);

          if (child.iterN(at, used, op)) return true;

          if ((n -= used) == 0) break;

          at = 0;

        } else at -= sz;

      }

    }

  };



  var nextDocId = 0;

  var Doc = CodeMirror.Doc = function(text, mode, firstLine) {

    if (!(this instanceof Doc)) return new Doc(text, mode, firstLine);

    if (firstLine == null) firstLine = 0;



    BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);

    this.first = firstLine;

    this.scrollTop = this.scrollLeft = 0;

    this.cantEdit = false;

    this.history = makeHistory();

    this.cleanGeneration = 1;

    this.frontier = firstLine;

    var start = Pos(firstLine, 0);

    this.sel = {from: start, to: start, head: start, anchor: start, shift: false, extend: false, goalColumn: null};

    this.id = ++nextDocId;

    this.modeOption = mode;



    if (typeof text == "string") text = splitLines(text);

    updateDoc(this, {from: start, to: start, text: text}, null, {head: start, anchor: start});

  };



  Doc.prototype = createObj(BranchChunk.prototype, {

    constructor: Doc,

    iter: function(from, to, op) {

      if (op) this.iterN(from - this.first, to - from, op);

      else this.iterN(this.first, this.first + this.size, from);

    },



    insert: function(at, lines) {

      var height = 0;

      for (var i = 0, e = lines.length; i < e; ++i) height += lines[i].height;

      this.insertInner(at - this.first, lines, height);

    },

    remove: function(at, n) { this.removeInner(at - this.first, n); },



    getValue: function(lineSep) {

      var lines = getLines(this, this.first, this.first + this.size);

      if (lineSep === false) return lines;

      return lines.join(lineSep || "\n");

    },

    setValue: function(code) {

      var top = Pos(this.first, 0), last = this.first + this.size - 1;

      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),

                        text: splitLines(code), origin: "setValue"},

                 {head: top, anchor: top}, true);

    },

    replaceRange: function(code, from, to, origin) {

      from = clipPos(this, from);

      to = to ? clipPos(this, to) : from;

      replaceRange(this, code, from, to, origin);

    },

    getRange: function(from, to, lineSep) {

      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));

      if (lineSep === false) return lines;

      return lines.join(lineSep || "\n");

    },



    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text;},

    setLine: function(line, text) {

      if (isLine(this, line))

        replaceRange(this, text, Pos(line, 0), clipPos(this, Pos(line)));

    },

    removeLine: function(line) {

      if (line) replaceRange(this, "", clipPos(this, Pos(line - 1)), clipPos(this, Pos(line)));

      else replaceRange(this, "", Pos(0, 0), clipPos(this, Pos(1, 0)));

    },



    getLineHandle: function(line) {if (isLine(this, line)) return getLine(this, line);},

    getLineNumber: function(line) {return lineNo(line);},



    getLineHandleVisualStart: function(line) {

      if (typeof line == "number") line = getLine(this, line);

      return visualLine(this, line);

    },



    lineCount: function() {return this.size;},

    firstLine: function() {return this.first;},

    lastLine: function() {return this.first + this.size - 1;},



    clipPos: function(pos) {return clipPos(this, pos);},



    getCursor: function(start) {

      var sel = this.sel, pos;

      if (start == null || start == "head") pos = sel.head;

      else if (start == "anchor") pos = sel.anchor;

      else if (start == "end" || start === false) pos = sel.to;

      else pos = sel.from;

      return copyPos(pos);

    },

    somethingSelected: function() {return !posEq(this.sel.head, this.sel.anchor);},



    setCursor: docOperation(function(line, ch, extend) {

      var pos = clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line);

      if (extend) extendSelection(this, pos);

      else setSelection(this, pos, pos);

    }),

    setSelection: docOperation(function(anchor, head, bias) {

      setSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), bias);

    }),

    extendSelection: docOperation(function(from, to, bias) {

      extendSelection(this, clipPos(this, from), to && clipPos(this, to), bias);

    }),



    getSelection: function(lineSep) {return this.getRange(this.sel.from, this.sel.to, lineSep);},

    replaceSelection: function(code, collapse, origin) {

      makeChange(this, {from: this.sel.from, to: this.sel.to, text: splitLines(code), origin: origin}, collapse || "around");

    },

    undo: docOperation(function() {makeChangeFromHistory(this, "undo");}),

    redo: docOperation(function() {makeChangeFromHistory(this, "redo");}),



    setExtending: function(val) {this.sel.extend = val;},



    historySize: function() {

      var hist = this.history;

      return {undo: hist.done.length, redo: hist.undone.length};

    },

    clearHistory: function() {this.history = makeHistory(this.history.maxGeneration);},



    markClean: function() {

      this.cleanGeneration = this.changeGeneration();

    },

    changeGeneration: function() {

      this.history.lastOp = this.history.lastOrigin = null;

      return this.history.generation;

    },

    isClean: function (gen) {

      return this.history.generation == (gen || this.cleanGeneration);

    },



    getHistory: function() {

      return {done: copyHistoryArray(this.history.done),

              undone: copyHistoryArray(this.history.undone)};

    },

    setHistory: function(histData) {

      var hist = this.history = makeHistory(this.history.maxGeneration);

      hist.done = histData.done.slice(0);

      hist.undone = histData.undone.slice(0);

    },



    markText: function(from, to, options) {

      return markText(this, clipPos(this, from), clipPos(this, to), options, "range");

    },

    setBookmark: function(pos, options) {

      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),

                      insertLeft: options && options.insertLeft};

      pos = clipPos(this, pos);

      return markText(this, pos, pos, realOpts, "bookmark");

    },

    findMarksAt: function(pos) {

      pos = clipPos(this, pos);

      var markers = [], spans = getLine(this, pos.line).markedSpans;

      if (spans) for (var i = 0; i < spans.length; ++i) {

        var span = spans[i];

        if ((span.from == null || span.from <= pos.ch) &&

            (span.to == null || span.to >= pos.ch))

          markers.push(span.marker.parent || span.marker);

      }

      return markers;

    },

    getAllMarks: function() {

      var markers = [];

      this.iter(function(line) {

        var sps = line.markedSpans;

        if (sps) for (var i = 0; i < sps.length; ++i)

          if (sps[i].from != null) markers.push(sps[i].marker);

      });

      return markers;

    },



    posFromIndex: function(off) {

      var ch, lineNo = this.first;

      this.iter(function(line) {

        var sz = line.text.length + 1;

        if (sz > off) { ch = off; return true; }

        off -= sz;

        ++lineNo;

      });

      return clipPos(this, Pos(lineNo, ch));

    },

    indexFromPos: function (coords) {

      coords = clipPos(this, coords);

      var index = coords.ch;

      if (coords.line < this.first || coords.ch < 0) return 0;

      this.iter(this.first, coords.line, function (line) {

        index += line.text.length + 1;

      });

      return index;

    },



    copy: function(copyHistory) {

      var doc = new Doc(getLines(this, this.first, this.first + this.size), this.modeOption, this.first);

      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;

      doc.sel = {from: this.sel.from, to: this.sel.to, head: this.sel.head, anchor: this.sel.anchor,

                 shift: this.sel.shift, extend: false, goalColumn: this.sel.goalColumn};

      if (copyHistory) {

        doc.history.undoDepth = this.history.undoDepth;

        doc.setHistory(this.getHistory());

      }

      return doc;

    },



    linkedDoc: function(options) {

      if (!options) options = {};

      var from = this.first, to = this.first + this.size;

      if (options.from != null && options.from > from) from = options.from;

      if (options.to != null && options.to < to) to = options.to;

      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from);

      if (options.sharedHist) copy.history = this.history;

      (this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});

      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];

      return copy;

    },

    unlinkDoc: function(other) {

      if (other instanceof CodeMirror) other = other.doc;

      if (this.linked) for (var i = 0; i < this.linked.length; ++i) {

        var link = this.linked[i];

        if (link.doc != other) continue;

        this.linked.splice(i, 1);

        other.unlinkDoc(this);

        break;

      }

      // If the histories were shared, split them again

      if (other.history == this.history) {

        var splitIds = [other.id];

        linkedDocs(other, function(doc) {splitIds.push(doc.id);}, true);

        other.history = makeHistory();

        other.history.done = copyHistoryArray(this.history.done, splitIds);

        other.history.undone = copyHistoryArray(this.history.undone, splitIds);

      }

    },

    iterLinkedDocs: function(f) {linkedDocs(this, f);},



    getMode: function() {return this.mode;},

    getEditor: function() {return this.cm;}

  });



  Doc.prototype.eachLine = Doc.prototype.iter;



  // The Doc methods that should be available on CodeMirror instances

  var dontDelegate = "iter insert remove copy getEditor".split(" ");

  for (var prop in Doc.prototype) if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)

    CodeMirror.prototype[prop] = (function(method) {

      return function() {return method.apply(this.doc, arguments);};

    })(Doc.prototype[prop]);



  eventMixin(Doc);



  function linkedDocs(doc, f, sharedHistOnly) {

    function propagate(doc, skip, sharedHist) {

      if (doc.linked) for (var i = 0; i < doc.linked.length; ++i) {

        var rel = doc.linked[i];

        if (rel.doc == skip) continue;

        var shared = sharedHist && rel.sharedHist;

        if (sharedHistOnly && !shared) continue;

        f(rel.doc, shared);

        propagate(rel.doc, doc, shared);

      }

    }

    propagate(doc, null, true);

  }



  function attachDoc(cm, doc) {

    if (doc.cm) throw new Error("This document is already in use.");

    cm.doc = doc;

    doc.cm = cm;

    estimateLineHeights(cm);

    loadMode(cm);

    if (!cm.options.lineWrapping) computeMaxLength(cm);

    cm.options.mode = doc.modeOption;

    regChange(cm);

  }



  // LINE UTILITIES



  function getLine(chunk, n) {

    n -= chunk.first;

    while (!chunk.lines) {

      for (var i = 0;; ++i) {

        var child = chunk.children[i], sz = child.chunkSize();

        if (n < sz) { chunk = child; break; }

        n -= sz;

      }

    }

    return chunk.lines[n];

  }



  function getBetween(doc, start, end) {

    var out = [], n = start.line;

    doc.iter(start.line, end.line + 1, function(line) {

      var text = line.text;

      if (n == end.line) text = text.slice(0, end.ch);

      if (n == start.line) text = text.slice(start.ch);

      out.push(text);

      ++n;

    });

    return out;

  }

  function getLines(doc, from, to) {

    var out = [];

    doc.iter(from, to, function(line) { out.push(line.text); });

    return out;

  }



  function updateLineHeight(line, height) {

    var diff = height - line.height;

    for (var n = line; n; n = n.parent) n.height += diff;

  }



  function lineNo(line) {

    if (line.parent == null) return null;

    var cur = line.parent, no = indexOf(cur.lines, line);

    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {

      for (var i = 0;; ++i) {

        if (chunk.children[i] == cur) break;

        no += chunk.children[i].chunkSize();

      }

    }

    return no + cur.first;

  }



  function lineAtHeight(chunk, h) {

    var n = chunk.first;

    outer: do {

      for (var i = 0, e = chunk.children.length; i < e; ++i) {

        var child = chunk.children[i], ch = child.height;

        if (h < ch) { chunk = child; continue outer; }

        h -= ch;

        n += child.chunkSize();

      }

      return n;

    } while (!chunk.lines);

    for (var i = 0, e = chunk.lines.length; i < e; ++i) {

      var line = chunk.lines[i], lh = line.height;

      if (h < lh) break;

      h -= lh;

    }

    return n + i;

  }



  function heightAtLine(cm, lineObj) {

    lineObj = visualLine(cm.doc, lineObj);



    var h = 0, chunk = lineObj.parent;

    for (var i = 0; i < chunk.lines.length; ++i) {

      var line = chunk.lines[i];

      if (line == lineObj) break;

      else h += line.height;

    }

    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {

      for (var i = 0; i < p.children.length; ++i) {

        var cur = p.children[i];

        if (cur == chunk) break;

        else h += cur.height;

      }

    }

    return h;

  }



  function getOrder(line) {

    var order = line.order;

    if (order == null) order = line.order = bidiOrdering(line.text);

    return order;

  }



  // HISTORY



  function makeHistory(startGen) {

    return {

      // Arrays of history events. Doing something adds an event to

      // done and clears undo. Undoing moves events from done to

      // undone, redoing moves them in the other direction.

      done: [], undone: [], undoDepth: Infinity,

      // Used to track when changes can be merged into a single undo

      // event

      lastTime: 0, lastOp: null, lastOrigin: null,

      // Used by the isClean() method

      generation: startGen || 1, maxGeneration: startGen || 1

    };

  }



  function attachLocalSpans(doc, change, from, to) {

    var existing = change["spans_" + doc.id], n = 0;

    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function(line) {

      if (line.markedSpans)

        (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans;

      ++n;

    });

  }



  function historyChangeFromChange(doc, change) {

    var from = { line: change.from.line, ch: change.from.ch };

    var histChange = {from: from, to: changeEnd(change), text: getBetween(doc, change.from, change.to)};

    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);

    linkedDocs(doc, function(doc) {attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);}, true);

    return histChange;

  }



  function addToHistory(doc, change, selAfter, opId) {

    var hist = doc.history;

    hist.undone.length = 0;

    var time = +new Date, cur = lst(hist.done);



    if (cur &&

        (hist.lastOp == opId ||

         hist.lastOrigin == change.origin && change.origin &&

         ((change.origin.charAt(0) == "+" && doc.cm && hist.lastTime > time - doc.cm.options.historyEventDelay) ||

          change.origin.charAt(0) == "*"))) {

      // Merge this change into the last event

      var last = lst(cur.changes);

      if (posEq(change.from, change.to) && posEq(change.from, last.to)) {

        // Optimized case for simple insertion -- don't want to add

        // new changesets for every character typed

        last.to = changeEnd(change);

      } else {

        // Add new sub-event

        cur.changes.push(historyChangeFromChange(doc, change));

      }

      cur.anchorAfter = selAfter.anchor; cur.headAfter = selAfter.head;

    } else {

      // Can not be merged, start a new event.

      cur = {changes: [historyChangeFromChange(doc, change)],

             generation: hist.generation,

             anchorBefore: doc.sel.anchor, headBefore: doc.sel.head,

             anchorAfter: selAfter.anchor, headAfter: selAfter.head};

      hist.done.push(cur);

      hist.generation = ++hist.maxGeneration;

      while (hist.done.length > hist.undoDepth)

        hist.done.shift();

    }

    hist.lastTime = time;

    hist.lastOp = opId;

    hist.lastOrigin = change.origin;

  }



  function removeClearedSpans(spans) {

    if (!spans) return null;

    for (var i = 0, out; i < spans.length; ++i) {

      if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i); }

      else if (out) out.push(spans[i]);

    }

    return !out ? spans : out.length ? out : null;

  }



  function getOldSpans(doc, change) {

    var found = change["spans_" + doc.id];

    if (!found) return null;

    for (var i = 0, nw = []; i < change.text.length; ++i)

      nw.push(removeClearedSpans(found[i]));

    return nw;

  }



  // Used both to provide a JSON-safe object in .getHistory, and, when

  // detaching a document, to split the history in two

  function copyHistoryArray(events, newGroup) {

    for (var i = 0, copy = []; i < events.length; ++i) {

      var event = events[i], changes = event.changes, newChanges = [];

      copy.push({changes: newChanges, anchorBefore: event.anchorBefore, headBefore: event.headBefore,

                 anchorAfter: event.anchorAfter, headAfter: event.headAfter});

      for (var j = 0; j < changes.length; ++j) {

        var change = changes[j], m;

        newChanges.push({from: change.from, to: change.to, text: change.text});

        if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {

          if (indexOf(newGroup, Number(m[1])) > -1) {

            lst(newChanges)[prop] = change[prop];

            delete change[prop];

          }

        }

      }

    }

    return copy;

  }



  // Rebasing/resetting history to deal with externally-sourced changes



  function rebaseHistSel(pos, from, to, diff) {

    if (to < pos.line) {

      pos.line += diff;

    } else if (from < pos.line) {

      pos.line = from;

      pos.ch = 0;

    }

  }



  // Tries to rebase an array of history events given a change in the

  // document. If the change touches the same lines as the event, the

  // event, and everything 'behind' it, is discarded. If the change is

  // before the event, the event's positions are updated. Uses a

  // copy-on-write scheme for the positions, to avoid having to

  // reallocate them all on every rebase, but also avoid problems with

  // shared position objects being unsafely updated.

  function rebaseHistArray(array, from, to, diff) {

    for (var i = 0; i < array.length; ++i) {

      var sub = array[i], ok = true;

      for (var j = 0; j < sub.changes.length; ++j) {

        var cur = sub.changes[j];

        if (!sub.copied) { cur.from = copyPos(cur.from); cur.to = copyPos(cur.to); }

        if (to < cur.from.line) {

          cur.from.line += diff;

          cur.to.line += diff;

        } else if (from <= cur.to.line) {

          ok = false;

          break;

        }

      }

      if (!sub.copied) {

        sub.anchorBefore = copyPos(sub.anchorBefore); sub.headBefore = copyPos(sub.headBefore);

        sub.anchorAfter = copyPos(sub.anchorAfter); sub.readAfter = copyPos(sub.headAfter);

        sub.copied = true;

      }

      if (!ok) {

        array.splice(0, i + 1);

        i = 0;

      } else {

        rebaseHistSel(sub.anchorBefore); rebaseHistSel(sub.headBefore);

        rebaseHistSel(sub.anchorAfter); rebaseHistSel(sub.headAfter);

      }

    }

  }



  function rebaseHist(hist, change) {

    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;

    rebaseHistArray(hist.done, from, to, diff);

    rebaseHistArray(hist.undone, from, to, diff);

  }



  // EVENT OPERATORS



  function stopMethod() {e_stop(this);}

  // Ensure an event has a stop method.

  function addStop(event) {

    if (!event.stop) event.stop = stopMethod;

    return event;

  }



  function e_preventDefault(e) {

    if (e.preventDefault) e.preventDefault();

    else e.returnValue = false;

  }

  function e_stopPropagation(e) {

    if (e.stopPropagation) e.stopPropagation();

    else e.cancelBubble = true;

  }

  function e_defaultPrevented(e) {

    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false;

  }

  function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}

  CodeMirror.e_stop = e_stop;

  CodeMirror.e_preventDefault = e_preventDefault;

  CodeMirror.e_stopPropagation = e_stopPropagation;



  function e_target(e) {return e.target || e.srcElement;}

  function e_button(e) {

    var b = e.which;

    if (b == null) {

      if (e.button & 1) b = 1;

      else if (e.button & 2) b = 3;

      else if (e.button & 4) b = 2;

    }

    if (mac && e.ctrlKey && b == 1) b = 3;

    return b;

  }



  // EVENT HANDLING



  function on(emitter, type, f) {

    if (emitter.addEventListener)

      emitter.addEventListener(type, f, false);

    else if (emitter.attachEvent)

      emitter.attachEvent("on" + type, f);

    else {

      var map = emitter._handlers || (emitter._handlers = {});

      var arr = map[type] || (map[type] = []);

      arr.push(f);

    }

  }



  function off(emitter, type, f) {

    if (emitter.removeEventListener)

      emitter.removeEventListener(type, f, false);

    else if (emitter.detachEvent)

      emitter.detachEvent("on" + type, f);

    else {

      var arr = emitter._handlers && emitter._handlers[type];

      if (!arr) return;

      for (var i = 0; i < arr.length; ++i)

        if (arr[i] == f) { arr.splice(i, 1); break; }

    }

  }



  function signal(emitter, type /*, values...*/) {

    var arr = emitter._handlers && emitter._handlers[type];

    if (!arr) return;

    var args = Array.prototype.slice.call(arguments, 2);

    for (var i = 0; i < arr.length; ++i) arr[i].apply(null, args);

  }



  var delayedCallbacks, delayedCallbackDepth = 0;

  function signalLater(emitter, type /*, values...*/) {

    var arr = emitter._handlers && emitter._handlers[type];

    if (!arr) return;

    var args = Array.prototype.slice.call(arguments, 2);

    if (!delayedCallbacks) {

      ++delayedCallbackDepth;

      delayedCallbacks = [];

      setTimeout(fireDelayed, 0);

    }

    function bnd(f) {return function(){f.apply(null, args);};};

    for (var i = 0; i < arr.length; ++i)

      delayedCallbacks.push(bnd(arr[i]));

  }



  function signalDOMEvent(cm, e, override) {

    signal(cm, override || e.type, cm, e);

    return e_defaultPrevented(e) || e.codemirrorIgnore;

  }



  function fireDelayed() {

    --delayedCallbackDepth;

    var delayed = delayedCallbacks;

    delayedCallbacks = null;

    for (var i = 0; i < delayed.length; ++i) delayed[i]();

  }



  function hasHandler(emitter, type) {

    var arr = emitter._handlers && emitter._handlers[type];

    return arr && arr.length > 0;

  }



  CodeMirror.on = on; CodeMirror.off = off; CodeMirror.signal = signal;



  function eventMixin(ctor) {

    ctor.prototype.on = function(type, f) {on(this, type, f);};

    ctor.prototype.off = function(type, f) {off(this, type, f);};

  }



  // MISC UTILITIES



  // Number of pixels added to scroller and sizer to hide scrollbar

  var scrollerCutOff = 30;



  // Returned or thrown by various protocols to signal 'I'm not

  // handling this'.

  var Pass = CodeMirror.Pass = {toString: function(){return "CodeMirror.Pass";}};



  function Delayed() {this.id = null;}

  Delayed.prototype = {set: function(ms, f) {clearTimeout(this.id); this.id = setTimeout(f, ms);}};



  // Counts the column offset in a string, taking tabs into account.

  // Used mostly to find indentation.

  function countColumn(string, end, tabSize, startIndex, startValue) {

    if (end == null) {

      end = string.search(/[^\s\u00a0]/);

      if (end == -1) end = string.length;

    }

    for (var i = startIndex || 0, n = startValue || 0; i < end; ++i) {

      if (string.charAt(i) == "\t") n += tabSize - (n % tabSize);

      else ++n;

    }

    return n;

  }

  CodeMirror.countColumn = countColumn;



  var spaceStrs = [""];

  function spaceStr(n) {

    while (spaceStrs.length <= n)

      spaceStrs.push(lst(spaceStrs) + " ");

    return spaceStrs[n];

  }



  function lst(arr) { return arr[arr.length-1]; }



  function selectInput(node) {

    if (ios) { // Mobile Safari apparently has a bug where select() is broken.

      node.selectionStart = 0;

      node.selectionEnd = node.value.length;

    } else {

      // Suppress mysterious IE10 errors

      try { node.select(); }

      catch(_e) {}

    }

  }



  function indexOf(collection, elt) {

    if (collection.indexOf) return collection.indexOf(elt);

    for (var i = 0, e = collection.length; i < e; ++i)

      if (collection[i] == elt) return i;

    return -1;

  }



  function createObj(base, props) {

    function Obj() {}

    Obj.prototype = base;

    var inst = new Obj();

    if (props) copyObj(props, inst);

    return inst;

  }



  function copyObj(obj, target) {

    if (!target) target = {};

    for (var prop in obj) if (obj.hasOwnProperty(prop)) target[prop] = obj[prop];

    return target;

  }



  function emptyArray(size) {

    for (var a = [], i = 0; i < size; ++i) a.push(undefined);

    return a;

  }



  function bind(f) {

    var args = Array.prototype.slice.call(arguments, 1);

    return function(){return f.apply(null, args);};

  }



  var nonASCIISingleCaseWordChar = /[\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;

  function isWordChar(ch) {

    return /\w/.test(ch) || ch > "\x80" &&

      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch));

  }



  function isEmpty(obj) {

    for (var n in obj) if (obj.hasOwnProperty(n) && obj[n]) return false;

    return true;

  }



  var isExtendingChar = /[\u0300-\u036F\u0483-\u0487\u0488-\u0489\u0591-\u05BD\u05BF\u05C1-\u05C2\u05C4-\u05C5\u05C7\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7-\u06E8\u06EA-\u06ED\uA66F\uA670-\uA672\uA674-\uA67D\uA69F\udc00-\udfff]/;



  // DOM UTILITIES



  function elt(tag, content, className, style) {

    var e = document.createElement(tag);

    if (className) e.className = className;

    if (style) e.style.cssText = style;

    if (typeof content == "string") setTextContent(e, content);

    else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);

    return e;

  }



  function removeChildren(e) {

    for (var count = e.childNodes.length; count > 0; --count)

      e.removeChild(e.firstChild);

    return e;

  }



  function removeChildrenAndAdd(parent, e) {

    return removeChildren(parent).appendChild(e);

  }



  function setTextContent(e, str) {

    if (ie_lt9) {

      e.innerHTML = "";

      e.appendChild(document.createTextNode(str));

    } else e.textContent = str;

  }



  function getRect(node) {

    return node.getBoundingClientRect();

  }

  CodeMirror.replaceGetRect = function(f) { getRect = f; };



  // FEATURE DETECTION



  // Detect drag-and-drop

  var dragAndDrop = function() {

    // There is *some* kind of drag-and-drop support in IE6-8, but I

    // couldn't get it to work yet.

    if (ie_lt9) return false;

    var div = elt('div');

    return "draggable" in div || "dragDrop" in div;

  }();



  // For a reason I have yet to figure out, some browsers disallow

  // word wrapping between certain characters *only* if a new inline

  // element is started between them. This makes it hard to reliably

  // measure the position of things, since that requires inserting an

  // extra span. This terribly fragile set of tests matches the

  // character combinations that suffer from this phenomenon on the

  // various browsers.

  function spanAffectsWrapping() { return false; }

  if (gecko) // Only for "$'"

    spanAffectsWrapping = function(str, i) {

      return str.charCodeAt(i - 1) == 36 && str.charCodeAt(i) == 39;

    };

  else if (safari && !/Version\/([6-9]|\d\d)\b/.test(navigator.userAgent))

    spanAffectsWrapping = function(str, i) {

      return /\-[^ \-?]|\?[^ !\'\"\),.\-\/:;\?\]\}]/.test(str.slice(i - 1, i + 1));

    };

  else if (webkit && !/Chrome\/(?:29|[3-9]\d|\d\d\d)\./.test(navigator.userAgent))

    spanAffectsWrapping = function(str, i) {

      if (i > 1 && str.charCodeAt(i - 1) == 45) {

        if (/\w/.test(str.charAt(i - 2)) && /[^\-?\.]/.test(str.charAt(i))) return true;

        if (i > 2 && /[\d\.,]/.test(str.charAt(i - 2)) && /[\d\.,]/.test(str.charAt(i))) return false;

      }

      return /[~!#%&*)=+}\]|\"\.>,:;][({[<]|-[^\-?\.\u2010-\u201f\u2026]|\?[\w~`@#$%\^&*(_=+{[|><]|…[\w~`@#$%\^&*(_=+{[><]/.test(str.slice(i - 1, i + 1));

    };



  var knownScrollbarWidth;

  function scrollbarWidth(measure) {

    if (knownScrollbarWidth != null) return knownScrollbarWidth;

    var test = elt("div", null, null, "width: 50px; height: 50px; overflow-x: scroll");

    removeChildrenAndAdd(measure, test);

    if (test.offsetWidth)

      knownScrollbarWidth = test.offsetHeight - test.clientHeight;

    return knownScrollbarWidth || 0;

  }



  var zwspSupported;

  function zeroWidthElement(measure) {

    if (zwspSupported == null) {

      var test = elt("span", "\u200b");

      removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));

      if (measure.firstChild.offsetHeight != 0)

        zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !ie_lt8;

    }

    if (zwspSupported) return elt("span", "\u200b");

    else return elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");

  }



  // See if "".split is the broken IE version, if so, provide an

  // alternative way to split lines.

  var splitLines = "\n\nb".split(/\n/).length != 3 ? function(string) {

    var pos = 0, result = [], l = string.length;

    while (pos <= l) {

      var nl = string.indexOf("\n", pos);

      if (nl == -1) nl = string.length;

      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);

      var rt = line.indexOf("\r");

      if (rt != -1) {

        result.push(line.slice(0, rt));

        pos += rt + 1;

      } else {

        result.push(line);

        pos = nl + 1;

      }

    }

    return result;

  } : function(string){return string.split(/\r\n?|\n/);};

  CodeMirror.splitLines = splitLines;



  var hasSelection = window.getSelection ? function(te) {

    try { return te.selectionStart != te.selectionEnd; }

    catch(e) { return false; }

  } : function(te) {

    try {var range = te.ownerDocument.selection.createRange();}

    catch(e) {}

    if (!range || range.parentElement() != te) return false;

    return range.compareEndPoints("StartToEnd", range) != 0;

  };



  var hasCopyEvent = (function() {

    var e = elt("div");

    if ("oncopy" in e) return true;

    e.setAttribute("oncopy", "return;");

    return typeof e.oncopy == 'function';

  })();



  // KEY NAMING



  var keyNames = {3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",

                  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",

                  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",

                  46: "Delete", 59: ";", 91: "Mod", 92: "Mod", 93: "Mod", 109: "-", 107: "=", 127: "Delete",

                  186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",

                  221: "]", 222: "'", 63276: "PageUp", 63277: "PageDown", 63275: "End", 63273: "Home",

                  63234: "Left", 63232: "Up", 63235: "Right", 63233: "Down", 63302: "Insert", 63272: "Delete"};

  CodeMirror.keyNames = keyNames;

  (function() {

    // Number keys

    for (var i = 0; i < 10; i++) keyNames[i + 48] = String(i);

    // Alphabetic keys

    for (var i = 65; i <= 90; i++) keyNames[i] = String.fromCharCode(i);

    // Function keys

    for (var i = 1; i <= 12; i++) keyNames[i + 111] = keyNames[i + 63235] = "F" + i;

  })();



  // BIDI HELPERS



  function iterateBidiSections(order, from, to, f) {

    if (!order) return f(from, to, "ltr");

    var found = false;

    for (var i = 0; i < order.length; ++i) {

      var part = order[i];

      if (part.from < to && part.to > from || from == to && part.to == from) {

        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");

        found = true;

      }

    }

    if (!found) f(from, to, "ltr");

  }



  function bidiLeft(part) { return part.level % 2 ? part.to : part.from; }

  function bidiRight(part) { return part.level % 2 ? part.from : part.to; }



  function lineLeft(line) { var order = getOrder(line); return order ? bidiLeft(order[0]) : 0; }

  function lineRight(line) {

    var order = getOrder(line);

    if (!order) return line.text.length;

    return bidiRight(lst(order));

  }



  function lineStart(cm, lineN) {

    var line = getLine(cm.doc, lineN);

    var visual = visualLine(cm.doc, line);

    if (visual != line) lineN = lineNo(visual);

    var order = getOrder(visual);

    var ch = !order ? 0 : order[0].level % 2 ? lineRight(visual) : lineLeft(visual);

    return Pos(lineN, ch);

  }

  function lineEnd(cm, lineN) {

    var merged, line;

    while (merged = collapsedSpanAtEnd(line = getLine(cm.doc, lineN)))

      lineN = merged.find().to.line;

    var order = getOrder(line);

    var ch = !order ? line.text.length : order[0].level % 2 ? lineLeft(line) : lineRight(line);

    return Pos(lineN, ch);

  }



  function compareBidiLevel(order, a, b) {

    var linedir = order[0].level;

    if (a == linedir) return true;

    if (b == linedir) return false;

    return a < b;

  }

  var bidiOther;

  function getBidiPartAt(order, pos) {

    for (var i = 0, found; i < order.length; ++i) {

      var cur = order[i];

      if (cur.from < pos && cur.to > pos) { bidiOther = null; return i; }

      if (cur.from == pos || cur.to == pos) {

        if (found == null) {

          found = i;

        } else if (compareBidiLevel(order, cur.level, order[found].level)) {

          bidiOther = found;

          return i;

        } else {

          bidiOther = i;

          return found;

        }

      }

    }

    bidiOther = null;

    return found;

  }



  function moveInLine(line, pos, dir, byUnit) {

    if (!byUnit) return pos + dir;

    do pos += dir;

    while (pos > 0 && isExtendingChar.test(line.text.charAt(pos)));

    return pos;

  }



  // This is somewhat involved. It is needed in order to move

  // 'visually' through bi-directional text -- i.e., pressing left

  // should make the cursor go left, even when in RTL text. The

  // tricky part is the 'jumps', where RTL and LTR text touch each

  // other. This often requires the cursor offset to move more than

  // one unit, in order to visually move one unit.

  function moveVisually(line, start, dir, byUnit) {

    var bidi = getOrder(line);

    if (!bidi) return moveLogically(line, start, dir, byUnit);

    var pos = getBidiPartAt(bidi, start), part = bidi[pos];

    var target = moveInLine(line, start, part.level % 2 ? -dir : dir, byUnit);



    for (;;) {

      if (target > part.from && target < part.to) return target;

      if (target == part.from || target == part.to) {

        if (getBidiPartAt(bidi, target) == pos) return target;

        part = bidi[pos += dir];

        return (dir > 0) == part.level % 2 ? part.to : part.from;

      } else {

        part = bidi[pos += dir];

        if (!part) return null;

        if ((dir > 0) == part.level % 2)

          target = moveInLine(line, part.to, -1, byUnit);

        else

          target = moveInLine(line, part.from, 1, byUnit);

      }

    }

  }



  function moveLogically(line, start, dir, byUnit) {

    var target = start + dir;

    if (byUnit) while (target > 0 && isExtendingChar.test(line.text.charAt(target))) target += dir;

    return target < 0 || target > line.text.length ? null : target;

  }



  // Bidirectional ordering algorithm

  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm

  // that this (partially) implements.



  // One-char codes used for character types:

  // L (L):   Left-to-Right

  // R (R):   Right-to-Left

  // r (AL):  Right-to-Left Arabic

  // 1 (EN):  European Number

  // + (ES):  European Number Separator

  // % (ET):  European Number Terminator

  // n (AN):  Arabic Number

  // , (CS):  Common Number Separator

  // m (NSM): Non-Spacing Mark

  // b (BN):  Boundary Neutral

  // s (B):   Paragraph Separator

  // t (S):   Segment Separator

  // w (WS):  Whitespace

  // N (ON):  Other Neutrals



  // Returns null if characters are ordered as they appear

  // (left-to-right), or an array of sections ({from, to, level}

  // objects) in the order in which they occur visually.

  var bidiOrdering = (function() {

    // Character types for codepoints 0 to 0xff

    var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLL";

    // Character types for codepoints 0x600 to 0x6ff

    var arabicTypes = "rrrrrrrrrrrr,rNNmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmrrrrrrrnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmNmmmmrrrrrrrrrrrrrrrrrr";

    function charType(code) {

      if (code <= 0xff) return lowTypes.charAt(code);

      else if (0x590 <= code && code <= 0x5f4) return "R";

      else if (0x600 <= code && code <= 0x6ff) return arabicTypes.charAt(code - 0x600);

      else if (0x700 <= code && code <= 0x8ac) return "r";

      else return "L";

    }



    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;

    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;

    // Browsers seem to always treat the boundaries of block elements as being L.

    var outerType = "L";



    return function(str) {

      if (!bidiRE.test(str)) return false;

      var len = str.length, types = [];

      for (var i = 0, type; i < len; ++i)

        types.push(type = charType(str.charCodeAt(i)));



      // W1. Examine each non-spacing mark (NSM) in the level run, and

      // change the type of the NSM to the type of the previous

      // character. If the NSM is at the start of the level run, it will

      // get the type of sor.

      for (var i = 0, prev = outerType; i < len; ++i) {

        var type = types[i];

        if (type == "m") types[i] = prev;

        else prev = type;

      }



      // W2. Search backwards from each instance of a European number

      // until the first strong type (R, L, AL, or sor) is found. If an

      // AL is found, change the type of the European number to Arabic

      // number.

      // W3. Change all ALs to R.

      for (var i = 0, cur = outerType; i < len; ++i) {

        var type = types[i];

        if (type == "1" && cur == "r") types[i] = "n";

        else if (isStrong.test(type)) { cur = type; if (type == "r") types[i] = "R"; }

      }



      // W4. A single European separator between two European numbers

      // changes to a European number. A single common separator between

      // two numbers of the same type changes to that type.

      for (var i = 1, prev = types[0]; i < len - 1; ++i) {

        var type = types[i];

        if (type == "+" && prev == "1" && types[i+1] == "1") types[i] = "1";

        else if (type == "," && prev == types[i+1] &&

                 (prev == "1" || prev == "n")) types[i] = prev;

        prev = type;

      }



      // W5. A sequence of European terminators adjacent to European

      // numbers changes to all European numbers.

      // W6. Otherwise, separators and terminators change to Other

      // Neutral.

      for (var i = 0; i < len; ++i) {

        var type = types[i];

        if (type == ",") types[i] = "N";

        else if (type == "%") {

          for (var end = i + 1; end < len && types[end] == "%"; ++end) {}

          var replace = (i && types[i-1] == "!") || (end < len - 1 && types[end] == "1") ? "1" : "N";

          for (var j = i; j < end; ++j) types[j] = replace;

          i = end - 1;

        }

      }



      // W7. Search backwards from each instance of a European number

      // until the first strong type (R, L, or sor) is found. If an L is

      // found, then change the type of the European number to L.

      for (var i = 0, cur = outerType; i < len; ++i) {

        var type = types[i];

        if (cur == "L" && type == "1") types[i] = "L";

        else if (isStrong.test(type)) cur = type;

      }



      // N1. A sequence of neutrals takes the direction of the

      // surrounding strong text if the text on both sides has the same

      // direction. European and Arabic numbers act as if they were R in

      // terms of their influence on neutrals. Start-of-level-run (sor)

      // and end-of-level-run (eor) are used at level run boundaries.

      // N2. Any remaining neutrals take the embedding direction.

      for (var i = 0; i < len; ++i) {

        if (isNeutral.test(types[i])) {

          for (var end = i + 1; end < len && isNeutral.test(types[end]); ++end) {}

          var before = (i ? types[i-1] : outerType) == "L";

          var after = (end < len - 1 ? types[end] : outerType) == "L";

          var replace = before || after ? "L" : "R";

          for (var j = i; j < end; ++j) types[j] = replace;

          i = end - 1;

        }

      }



      // Here we depart from the documented algorithm, in order to avoid

      // building up an actual levels array. Since there are only three

      // levels (0, 1, 2) in an implementation that doesn't take

      // explicit embedding into account, we can build up the order on

      // the fly, without following the level-based algorithm.

      var order = [], m;

      for (var i = 0; i < len;) {

        if (countsAsLeft.test(types[i])) {

          var start = i;

          for (++i; i < len && countsAsLeft.test(types[i]); ++i) {}

          order.push({from: start, to: i, level: 0});

        } else {

          var pos = i, at = order.length;

          for (++i; i < len && types[i] != "L"; ++i) {}

          for (var j = pos; j < i;) {

            if (countsAsNum.test(types[j])) {

              if (pos < j) order.splice(at, 0, {from: pos, to: j, level: 1});

              var nstart = j;

              for (++j; j < i && countsAsNum.test(types[j]); ++j) {}

              order.splice(at, 0, {from: nstart, to: j, level: 2});

              pos = j;

            } else ++j;

          }

          if (pos < i) order.splice(at, 0, {from: pos, to: i, level: 1});

        }

      }

      if (order[0].level == 1 && (m = str.match(/^\s+/))) {

        order[0].from = m[0].length;

        order.unshift({from: 0, to: m[0].length, level: 0});

      }

      if (lst(order).level == 1 && (m = str.match(/\s+$/))) {

        lst(order).to -= m[0].length;

        order.push({from: len - m[0].length, to: len, level: 0});

      }

      if (order[0].level != lst(order).level)

        order.push({from: len, to: len, level: order[0].level});



      return order;

    };

  })();



  // THE END



  CodeMirror.version = "3.16.0";



  return CodeMirror;

})();

